No. 2330. DIPTEROUS GENU8 ZYG0THBICA—8TURTEVANT. 



157 



proboscis longer than head is high ; no prescutellars ; preapicals evi- 

 dent on second and third tibiae; discal and second basal cells con- 

 fluent ; costal vein reaches to apex of fourth vein. 



Wiugs clear; eyes laterally produced to a sliarp liorizoutal edge in the male; 



mesonotum brown Z. dispar. 



Wings ornamented ; eyes of male not produced ; mesonotum shining black 



Z. aldricMi. 



Wings clear; eyes not produced in the male; mesonotum brown Z. {?) brunnea. 



ZYGOTHRICA DISPAR Wiedemann. 



DrosopMliira catidata Hendel, Ent. Mitth., vol. 2, 3913, p. 387. 



Both sexes have been fully described by Hendel. The preapicals 

 are evident on the second and third tibiae; other than this his cle- 

 scrij)tions fit the material I have seen. The species is, however, vari- 

 able in color. The descriptions of this character given by Wiede- 

 mann and by Hendel in his two 

 papers can all be matched in 

 the series, but the darker types 

 are most frequent. 



Specimens examined: Trini- 

 dad River (over 150 specimens, 

 11 of them bred from "white 

 toadstool"), Ala juelo (4 speci- 

 mens), Panama (A. Busck). 



Recorded from Peru (Hen- 

 del), Bolivia (Hendel), and 

 Brazil (Wiedemann). 



ZYGOTHRICA ALDRICIIII, new species. 



Male. — Arista with about six 

 branches above and two below. 

 Antennae yellowish brown. Front about half width of head above, 

 narrower below. Three orbital bristles. Front shining yellow below ; 

 orbits and triangle reddish brown, frontal lines black. Postverti- 

 cals large. Eyes nearly bare. Carina large. Face protuberant, 

 yellow. One large oral bristle. Proboscis longer than height of 

 head; it and palpi yellow. Cheeks yellow. 



Acrostichal hairs in six rows. Mesonotum and scutellum shining 

 black. Pleurae and legs pale yellow. 



Abdomen shining black. 



Wings with three black spots — a basal one extending on the costal 

 margin to just beyond the apex of the first vein, and reaching to the 

 fifth vein, thus including the anterior crossvein ; one on the anterior 

 margin extending from a point above the posterior crossvein to the 

 apex of the fourth vein ; one around the posterior crossvein. Costa 

 with a break at the humeral crossvein and another one just before the 



Fig. 1.— ZYGOTHRICA DisrEE Wiedemann. Up- 

 per, HEAD OP MALE FROM ABOVE; LOWER, 

 HEAD OF MALE FROM IN FRONT AND A LITTLE 

 BELOW. 



