AKT.9 FLIES OF THE GENUS STYLOGASTEE ALDRICH 15 



Originally described from 20 female specimens, taken near San 

 Rafael, Vera Cruz, Mexico. See note under stylosa as to these 

 types. 



STYLOGASTER ORNATIPES Krober 



Stylogaster ornatipes Krobei;, Entom. jNIitteilun.wn, vol. 3, 1914, p. 350; 

 Archiv. Natnrgesch., vol. 83, 1917 (1919), p. 43, pi. 8, fig. 58. 



Male. — Frontal triangle very large, shining black, blunt anteriorly, 

 almost touching the lunule, a faint light streak extending forward 

 from the median ocellus; remainder of front velvety black, except 

 a silvery marginal streak ascending from the face and rapidly nar- 

 rowing to about the middle of the frontal orbit. First joint of 

 antennae rather dark yellow; second brown; third blackish except 

 on under side and near base, broader near base than in most of the 

 species, a little more than twice the length of the second joint. 

 Mesonotum shining black, the humerus white and with a narrow 

 yellowish border behind and mesially. Scutellum blackish; hind 

 edge of mesonotum brown. Metanotum black on middle, the usual 

 brown stripe on the mesopleura extends to the pteropleura and 

 sternopleura where it is somewhat lighter in color. There is also 

 a brown spot in front of the base of the halteres. Humeral 1 ; noto- 

 pleural 2 ; supraalar 2. 



Abdomen blackish, with the usual lateral paler triangles on the 

 third and fourth segments, very slightly developed on the fifth. 

 First abdominal segment with dense pale bristles at the sides, arising 

 from a slightly darker area; second segment with numerous, irregu- 

 larly arranged, large white lateral bristles among which two or three 

 of the upper are black ; sixth segment wholly brown, longer and more 

 conspicuous than usual; seventh segment also brown. Genitalia 

 yellow, posterior forceps small and not distinctly visible, anterior 

 forceps \&Yy wide with a row of conspicuous dark hairs on the hind 

 edge, partl}^ concealing the posterior forceps. 



Front legs pale yellow, the coxae with a tuft of black hairs at tip 

 on the front side and a few pale ones on the posterior side. Middle 

 femora rather stout, somewhat brownish above ; middle tibiae yellow, 

 gradually enlarged and pale; beyond the middle on the flexor side, 

 a very striking cluster of long black hairs extending far beyond the 

 apex. Anteriorly this brush is united with a group of much shorter 

 black hairs; middle tarsi yellow, the first joint enlarged on the dorsal 

 side before the middle and bearing five or six black erect spines in 

 a row; hind femora with the usual two dark annuli, the basal one 

 being quite diffused and brownish. The usual villous hairs on the 

 inner side at the lower edge are comparatively few in this species 

 and form a single, or partly double, erect row of about uniform 

 length, the trochanter being entirely bare and shining brown in color ; 



