AUT. 10 TROPICAL AMERICAN DIPTERA VAN DUZEE 61 



margin forty-sixth fiftieths, this portion of fourth vein nearly strai«Tht 

 and endinf^ considerably before the apex of the wing; third vein 

 arched so it,s tip is close to that of fourth; posterior margin of wing 

 distinctly notched at tip of fifth vein. 



Described from one female, taken by W. A. Kel]erman. at Los 

 Amates, Guatemala. 



Type. — In the Museum of Comparative Zoology. 



This female can be recognized by the long lower part of the face, 

 ■which is mostly brown, the black wings, yellow antennae and pale 

 orbital cilia. 



PELASTONEURUS PECTINATUS, new species 



Male. — Length 4.7 mm. Face silvery white with the green ground 

 color showing through on upper fourth, wide, its sides nearly par- 

 allel, the suture below the middle ; palpi black with a yellow margin, 

 covered with white pollen and black hair; antennae yelloAv, third 

 joint mostly brown, about as long as wide, rounded at tip; lateral 

 and inferior orbital cilia white, the longer bristles under the head 

 yelloAv. 



Dorsum of thorax blue-green with a median bronze stripe, 

 anterior portion of thorax more coppery; pleurae green, covered 

 with white pollen; the velvety black stripe above the root of the 

 w^ing and the silvery white spot at the suture not very distinctly 

 limited, a very small spot of white pollen on posterior angles of 

 thorax. Abdomen shining green; posterior margins of segments 

 narrowly black; large spots of Avhite pollen on the sides of the 

 segments; last segment wholly white pollinose, Hypopygium large, 

 scarcely petiolate, black, dulled with white pollen, its lamellae 

 (fig. 74) black with a row of blunt black bristles along the edge and 

 several long hairs near the base. 



Fore coxae, all femora and tibiae wholly yellow; middle and 

 hind coxae black with narrow yellow tips; middle tibiae with one 

 large bristle below near apical fourth and one on anterior surface 

 before the middle; fore tarsi yellow with the fifth joint brown; 

 middle and hind tarsi mostly brown or blackish; joints of fore 

 tarsi as 33-19-17-13-12; of middle ones as 50-32-24-15-11; joints 

 of posterior pair as 36-47-34-21-15. Calypters and halteres yellow, 

 tlie former Avith black cilia. 



Wings grayish, almost brownish; third vein nearly straight; 

 fourth vein bent near the middle of its last section, a little arched 

 beyond the bend, reaching the wing margin before the apex of the 

 wing; last section of fifth vein, if continued to wing margin would 

 be 29, cross vein nineteen-fiftieths of a millimeter long; hind margin 

 of wing with a small notch at tip of fifth vein. 



