no. 2070. PARASITIC AND PREDACEOUS DIPTERA— WALTON. 185 



NEODICHOCERA TRIDENS, new species. 



Plate 7, figs. 8-12. 



Black Sarcophagidlike, silvery gray pollinose. Length, 8-9 mm. 

 Extreme tip of abdomen and visible hypopygium yellow. Head 

 slightly broader than thorax. Frontal vitta bright reddish brown, 

 exceedingly short, not longer than width of front at narrowest point. 

 Ocellar triangle and sides of front black, gray pollinose, bearing a 

 single frontal row on each side, outside of these sprinkled with fine 

 black erect hairs to a point slightly below middle of eye. Orbital 

 bristles absent. Cheeks about as wide as eye height, black, densely 

 hairy, hairs merging into macrochaetae on anterior margins. Vibrisae 

 strong, cruciate, placed on orai margin. Transverse impression of 

 face well marked, brownish. 



Proboscis brown, slightly longer than one-half height of head, palpi 

 yellow. Antennae nearly as long as face, first segment brown, pro- 

 jecting distinctly above level of front, second joint yellowish, bearing 

 one unusually strong, proclinate macrochaeta on its lower front edge. 

 Third joint brown, distinctly grayish pubescent, divided into three 

 long lobes, the inner, the longest, the outer, the shortest. Arista 

 nearly as long as third antennal joint, thickened almost to the tip, 

 black, length of segments variable. Occiput excepting space above 

 central foramen thickly gray pilose. Eyes densely hairy except along 

 posterior margin. Thorax black, gray pollinose with four distinct 

 black vittse on the dorsum, extending to but coalescing immediately 

 before scutellum. Scutellum rather small, rounded, black at base, 

 piceous on apical two-thirds. Bearing three or four pairs of long 

 marginals, also a strong discal pair. Dorso-central bristles four, 

 sterno-pleurals two. One specimen bears a single long apical scutellar 

 bristle. Abdomen ovate, black, pseudo-maculate, with a distinct 

 black median vitta, gray pollinose. Segments 2 and 3 with a slight 

 rufous tinge on sides. Fourth segment black at base, apical half and 

 hypopygium yellowish red. First two segments destitute of discals 

 and marginals m dorsum. Third bearing a median marginal pair. 

 Hypopygium bearing black bristles. Legs, including tarsi, entirely 

 black. Middle tibiae (pi. 7, fig. 10) bearing three strong macrochaetae 

 on front side near middle. Hind tibiae (pi. 7, fig. 11) coarsely 

 pectinate with macrochaetae. Calypters white, wings (pi. 7, fig. 12) 

 hyaline, comparatively small, veins black, costal spine almost obso- 

 lete. Bend of fourth vein obtusely angular, destitute of stump or 

 wrinkle. Apical cell distinctly open in margin before tip of wing. 

 Base of third vein bearing five or six weak bristles. 



Habitat. — Koehler, New Mexico. 



Described from two males. Species resembles superficially Dicho- 

 cera lyrata Williston, collected by Dr. J. M. Aldrich in Idaho 18 years 

 ago, 1 but structurally quite distinct. 



Type.— Cat. No. 18343, U.S.N.M. 



> Eut. News, vol. 6, p. 29. 



