Behind a typically abstruse giallo title (the plot's link to a butterfly of any kind is extremely tenuous) lies a film that rarely feels like a typical giallo, with more police procedure and courtroom drama than usual. Director Duccio Tessari's film opens in familiar territory with the murder of a young woman in a park, the killer, in raincoat and hat, making his escape, but witnessed by several people. The police investigate the crime scene, forensics gathering numerous pieces of evidence, all of which points to TV reporter Alessandro Marchi (Giancarlo Sbragia) as the guilty party. The rest of the first half of the film is dedicated to the trial of Allesandro, with dreary flashbacks and cross-examination making the film something of a chore to sit through.

Found guilty of murder, Allesandro is sentenced to life, but while he is in prison, the killings continue, the modus operandi the same as before, the culprit contacting the police with a whispered phone call. When Allesandro's mistress comes forward with vital information that seems to prove his innocence, Allesandro is freed (much to the annoyance of his wife, who also has a lover). After much intrigue, Tessari eventually pulls together all the plot threads for an unexpected twist ending that goes some way to make the duller moments seem a bit more worthwhile. As far as the death scenes go, they are extremely tame and likely to disappoint fans of Argento or Fulci, and despite a fair few attractive women, the level of nudity is also fairly low.

Perhaps the most notable things about the film are its police inspector's strange obsession with coffee, and the cop who falls over running down some stairs during a chase on foot through the streets of Milan (it looks unintentional and is never spoken of).

5.5/10, rounded up to 6 for IMDb.

You have to be a fan of the genre to watch those movies. A lot of sleaze and a lot of exploitation going on. Or you're movie mad like me and you watch almost anything that is suggested to you ... I roll like that. So this Giallo that is also part court room drama and has other elements to it at times, works like a mystery thriller would (or a whodunnit).

Decently told with enough sensationalism, action and nudity to keep anyone occupied who wants to be ... some very nice performances and the music works too. Editing is also a big part especially considering the murder that this movie begins with ... so a good movie overall that still won't get to those who dislike these types of movies ... but they are not the target (audience) ... so there's that.

Duccio Tessari is probably best known as the director of several Spaghetti Westerns, most prominently the "Ringo" films with Giuliano Gemma, as well as the well-known Italian Crime flick "Tony Arzenta". The man also served as an (uncredited) co-writer of Sergio Leone's Italian Western milestone "Fistful of Dollars", and as a writer of several sword and sandal films in the early 60s. As a director, Tessari's doubtlessly best films are his two intelligent and plot-driven Gialli, "L'Uomo Senza Memoria" (aka. "The Man Without Memory", 1974) and this gem. "Una Farfalla Con Le Ali Insanguiante" aka. "Bloodstained Butterfly" of 1971 is a terrific, beauty- and suspenseful example for a purely plot-based Giallo that profits from an excellent cast, a great score, wonderful settings and a sublime cinematography. As it is the case with Tessari's other Giallo, "The Man Without Memory", "Bloodstained Butterfly" is a Giallo that focuses on the Mystery more than the Horror-elements of the genre. And the film is indeed a perfectly constructed puzzle of a mystery that is (though convoluted) always easy to follow.

When a French exchange student (Carole André) is murdered by multiple stabbing in a park in Bergamo, the police arrest TV anchor Marchi (Giancarlo Sbragia). Marchi's daughter Sarah (Wendy D'Olive),who was friends with the murdered girl, does not believe in her father's guilt... As said above, this is a purely story-driven Giallo. For genre-standards, there are only very few murders and very little gore. The film is very suspenseful, however, and delivers mystery and innovative twists from the beginning to the end, as a good Giallo should. The beautiful Bergamo locations are a wonderful setting for the film, which is furthermore (in good Giallo-tradition) brilliantly photographed. The beautiful score intensifies the atmosphere, and the film profits from a very good ensemble cast. The characters are all complex and elaborate. The always-sinister Helmut Berger and Italian Grenre-cinema regulars such as Ida Galli ("The Case Of The Scorpion's Tail"),Günter Stoll ("What Have They Done To Solange"),Silvano Tranquilli ("The Black Belly of The Tarantula"),and Giancarlo Sbragia ("Tony Arzenta") all deliver very good performances. As said, for a Giallo this features little violence and gore and also little sleaze, but the magnificently elaborate plot should be more than pleasant to Genre-fans. "Bloodstained Butterfly" is beautifully filmed with a lot of style, and highly recommended to my fellow Giallo-fans.