22 PROCEEDINGS OF THE NATIONAL MUSEUM vol.66 



With no prescutellars ; scutellum with greenish-black disk, bordered uni- 

 formly with yellow pollen ; male with only appressed hair on flexor 



surface of middle tibia townsendi, new species. 



4. Abdomen shining blue in color comata, new species. 



Abdomen black with golden pollinose pattern angusta, new species. 



NOTOCHAETA COMATA, new species 



Male. — Front 0.12 and 0.14 of the headwidtli in the two specimens. 

 Parafrontais and paraf acials golden pollinose ; frontal bristles about 

 10, the uppermost 3 pairs reclinate, the lowest of all reaching to the 

 first third of the second antennal joint, the rows diverging only 

 gradually; antennae black, third joint three times the second, arista 

 long plumose not quite to tip. Palpi black, of ordinary size; pro- 

 boscis short. Back of head with black hairs, only a few pale around 

 the neck and below. Buca one-fifth the eye height. 



Thorax black with green reflections; mesonotum when viewed 

 from behind with two white pollinose stripes just inside the dorso- 

 central row^s, and another pair from humeri to suture; behind the 

 suture these begin again a little higher up and converge to follow the 

 sides of the scutellum nearly to its apex. Presutural acrostichals 

 small but distinct; sternopleurals 3, the intermediate smaller and 

 almost in line with the others. 



Abdomen subshining, blue-green, with very faint pollen except 

 below ; bristles as in generic characters ; genital segments of moderate 

 size, without bristles, but just below the anus on the inner forceps 

 with a striking tuft of hairs. Fifth sternite with large, diverging, 

 bare lobes, which turn up suddenly in a lobe directed forward and 

 are truncate beyond this. 



• Legs black, the femora slightly bluish ; middle tibia on inner hind 

 side Avith suberect hair, hind tibia on inner flexor side with 2 to 3 

 longer, fine hairs, on outer side with one bristle. 



Wings slightly smoky ; third vein curved so as to widen the apical 

 cell beyond its middle; third vein hairy almost to small cross vein. 



Length, 7.5 and 8 mm. 



Described from tw^o males collected at La Suiza, Costa Rica, 

 April 20 and 24, 1923, by Pablo Schild ; they were sent to the Mu- 

 seum for identification by Prof. A. L. Melander, and the type is re- 

 turned to him. 



Paratype.—M^lQ, Cat. No. 26842, U.S.N.M. 



NOTOCHAETA TOWNSENDI, new species 



Male. — Front 0.18 of the head wddth in each of the two specimens ; 

 parafrontais and parafacials light golden pollinose, the latter with 

 a few just distinguishable, minute black hairs in a single row; 

 frontals about 14, the upper 3 reclinate, the remainder rather fine 



