1919] Hine: Genus Erax 151 



The type, which Mr. Schaeffer kindly sent me for study, 

 is in Brooklyn, and was collected in Shasta County, California. 



Erax texanus Banks n. sp. 



Male. Total length 23 millimeters. Head white-haired; palpi 

 black haired, ocellar and upper orbital bristles black. Thorax with 

 short black hair, pleura white haired. Abdomen without parted hair, 

 the basal segment with long white hair on the sides and beneath, and 

 the apical parts of the segments whitish pollinose, sixth and seventh 

 silvery, sixth blackish at base. Abdomen rather long and slender, 

 the hy|3iopygium much narrower than the last segment, long and slender, 

 black haired. Femora black, tibiae reddish on basal part, black beyond, 

 tarsi almost black, femur black haired above, beneath and the tibia 

 white haired, except that the latter has dark hair near the tip. Wings 

 with costa normal, third vein with end before wing tip, the fork very 

 much before the base of the second posterior cell. Figure 43. 



From Texas (Lafr.). The hypopygium is much longer than 

 in Erax i>aripes. 



Erax triton Osten Sacken. 



Face yellowish-pollinose ; facial tubercle prominent, with a tuft of 

 pale yellowish hairs and bristles; palpi beset with black bristles, mixed 

 with yellow ones; cheeks with soft, whitish hair; upper occipital orbit 

 with a row of stiff black bristles; basal joints of the antennae reddish, 

 the third joint darker; arista much longer than the third joint. Thorax 

 with a well-marked, broad, dark brown dorso-central stripe, its median 

 line feebly marked, reddish; sides of the dorsum yellowish, with slight' 

 brassy reflections; pleurae brownish-yellow, with soft pale hairs; scutellum 

 yellowish-gray pollinose, with black macrochaetae. Halteres reddish- 

 yellow. Abdomen, male, its prevailing color, an impure, somewhat 

 silvery, white, with a row of black triangles, the triangles gradually 

 diminishing in size from segment two to segment five, segment six 

 with only a brownish line in the middle; segment one blackish, with 

 some grayish pollen on the sides; forceps rather large, elongate, reddish- 

 brown, beset with paler hairs and with a brush of hairs on the underside, 

 in shape like those of E. anomalus. Female, the black triangles of nearly 

 equal size on segments two to four, occupying the whole middle of the 

 segment and touching the hind margin with the apex; the sides of the 

 segments filled by triangles of an impure silvery -white ; on segments six 

 and seven the lateral margins only whitish, the middle occupied by an 

 opaque square of brownish-black; segment five forms the transition 

 in both sexes, but principally in the male; the silvery parts of segments 

 two to four beset with sparse white hairs, combed outwards; ovipositor 

 comparatively short, equal to about two or two and a half of the pre- 

 ceding segments; legs deep reddish, with the usual appressed pubescence 

 or whitish hairs and long, soft, whitish or yellowish hairs (especially 

 in the male) and black bristles; femora black on the underside. AVings 



