WLLISTON DIPTERA BRASILIANA. 121 



By comparing Wiedemann's text it will be seen that he drew his 

 description from four or more specimens : a female which he called a 

 male, presumably from North America; the original Fabrician type — 

 Cotiops stylata — without abdomen, from S mth America, and which 

 was undoubtedly a female ; and specimens from South America in the 

 Frankfort Museum, which he believed to represent both sexes, but 

 which were in reality females. In a word, all his specimens were 

 females, but, as we. shall see, belonging to two different species. 



To make this clear, I shall quote from the description fully: " Bei 

 Maennchen ist die Faerbung ueberhaupt lichter und mehr gelblich, 

 der Hinterleibsgriffel kurzer, an der Spitze kurz und schwarz borstig 

 und queer gespalten, so dass der obere Theil einen schmaeleren, laen- 

 geren, etwas aufwaerts ragendeden Fortsatz, der unteren ein stump- 

 feres, wie es scheint, zweilappiges Ende bildet. * * Bei Maennchen 

 liegt er [der Hinterleibsgriffel] mit dem Hinterleibe in gerade Rich- 

 tung. " This description applies excellently well to my Brazilian 

 female specimen. We may call the species a. 



"Aus Fabricius Beschreibung des Hinterleibes, wie auch der Fiihler, 

 sollte man ein Maennchen [i. e. a female, sp. a\ schliessen ; aber bei 

 dem Weibchen, welches uebrigens in Farbe der Beine und Zeichnung 

 mit jenem voellig uebereinstimmt, ist der Griffel am After noch viel 

 laenger, fast 6 Linien ; * * das Ende ist walzenfoermig, mit ganz 

 kurzer Spitze, und der ganzen Griffel geht unter einem weniger als 

 rechten winkel vom Hinterleibe ab ; * * Die Fuehler des Weibchens 

 sind groesser, und zumal ist das fast breit saebelfoermig dritte Glied 

 auf Kosten des zweiten so vergroessert, dass diese nur wenig groesser 

 als das erste erscheint. " This description applies perfectly to the 

 female of .S*. neglecta Will., except in the length of the oviduct. (Com- 

 pare Trans. Conn. Acad. vol. vi, pi. x, fig. 6.) We may call the 

 species b. 



The first question is : Are a and b identical with bia7inulata and 

 neglecta? That neglecta occurs in South America is not improbable, 

 but the only evidence we have so far is the above description of the 

 Frankfort specimen or specimens, which of course could easily apply 

 to an allied but distinct species I have but a single male of biannu- 

 lata, from North America, and the above mentioned female from 

 South America. It is not at all unlikely that they are the same, yet, 

 from the peculiar secondary sexual chatacters in the hind legs of the 

 male, and the remarkable oviduct of the female, I can venture no 

 positive opinion. But, since Mr. Roeder has presumably compared 

 my description of the male with his specimen, and because Wiede- 

 mann compared North and South American female specimens, it 

 seems as though we might accept the identity. 



