S. W. Williston — North American Conopidm. 93 



Stylogaster biannulata (Say). 



MyojKi hiannuloia Say, J. Acad. Phil., 81, 3; Compl. Wr., ii, 72. 



? Stylogaster stylaius (Fab.) Macq. Dipt. Exot., ii, 3, 17 ; tab. ii, f. 3; Fabricius, Syst. 



Antl., 177, 11 (Oonops); Wied., Atis. Zw.. ii, 243, 2 {Myopa). 

 Stylomyia confusa Westwood, Proc. Zool. Soc. London, 1850, p. 271. 



^ . Ratlier larger than S. neglecta. Second joint of antennae 

 nearly as long as the third, the third scarcely three times longer 

 tlian Avide, blackish on outer part ; face silvery white ; front black- 

 ish, yellowish or silvery on the sides. Proboscis black, with whitish , 

 base and tip. Dorsum of thorax black, with black l>ristles, the sides 

 and pleurae whitish yellow. Abdomen yellow, on the posterior bor- 

 ders of the second to sixth segments brownish ; pile blackish ; hypo- 

 pygium rather smaller than in S. neqUeta. Anterior and middle coxa? 

 and legs light yellow, two or three last joints of tarsi blackish; 

 hind femora biannulate as in 8. neglecta ; on the under side of basal 

 third there is a conspicuous brush of fine long black pile; hind tibise 

 on basal three-fifths yellow, short black pilose at the base, whitish 

 pilose near the middle, distinctly angulated and bent away on distal 

 ])ortion, blackish and with longer fine black pile, leaving a space, when 

 tibijB are flexed, that is filled by these bi'ushes of pile ; hind tarsi 

 black. Wing distinctly broader than in 8. neglecta^ the posterior 

 cross-vein less straight, the first posterior cell shorter and broader, 

 and the last section of the fourth vein more deeply curved. Length, 

 7""". One specimen. Conn. 



The present species has been the subject of no little confusioi]. 

 Wiedemann, who considered Say's species a synonym of Cono})s sty- 

 latus Fab., evidently had two distinct species before him, as is evi- 

 denced by his description of the third joint of the female's antennae, 

 which he says was increased in size at the cost of the second joint. 

 Numerous specimens of the preceding species have satisfied me that 

 there is no such diflTerence between the male and female antennae. 

 The type specimen of Co'nops stglatzis Fab. was a female, and the 

 North American specimen that Wiedemann had was a male, which 

 from the smaller third antennal joint seems to have been this. As 

 Wiedemann could not have had the same species as Fabriciiis' type, 

 there is of course no evidence that the present is S. stglata, and 

 indeed the piobabilities are that it is not. Macquart's figure and 

 descriptions are utterly worthless, as he evidently never saw a speci- 

 men nor even a figure of the insect. 



Say's description of the third joint of the antennae being yellowish 

 rufous, the extreme joint dusky, the margins of the thorax and the 



