12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 123 



Note. — The male of H. ornata is recognizable easily by the long 

 retrorsely directed setae on the hypopygial lamella with one of the 

 setae having an enlarged tip. 



Group III 



Tibiae bearing strong setae or distinct rows of setae, hind tibia with 

 distinct apicals or ventrals, hypopygial lamellae broad with hairs 

 on the surface. The group contains the following two species. 



Harmstonia recta, new species 



Figure 12 



Male. — Length 1.25 mm; wing 1.60 mm by 0.27 mm. Face very 

 narrow but distinct to mouth; front grayish; antennal segment 3 

 short, rather truncate with lower corner slightly projecting. Tro- 

 chanters, tibiae, and bases of fore- and middle basitarsi pale, legs 

 otherwise brown to blackish; middle and hind femora with a preapical 

 bristle, hind femur with setae somewhat longer along antero- and 

 posteroventral surfaces; foretibia with three stout anterodorsals and 

 an apical ventrally, middle tibia with an anterodorsal and a postero- 

 dorsal near basal third, an anterodorsal near distal third, three 

 distinct apicals of which ventral 2 are larger, hind tibia with an 

 anterodorsal near tip, five stout posterodorsals, three stout antero- 

 ventrals along distal half, a series of erect hairs posteroventrally 

 that seem to continue along basitarsus, three apicals; lengths of 

 segments of foretarsus from base as .19-.11-.06-.04-.06 mm; middle 

 tarsus as .20-.09-.06-.04-.06 mm; hind tarsus as .17-.19-.09-.05-.07 

 mm. Tips of wing veins 2 and 3 are \){ to 1% times as far apart as 

 tips of veins 3 and 4, vein 3 curved slightly backward to become 

 nearly parallel with vein 4 dis tally; crossvein 1% to l)i times as long 

 as last of vein 5; knob of halter yellow. Abdomen straight, hypo- 

 pygium (fig. 12) ca. .32 mm long, directed downward; hypopygial 

 lamella rather triangular, yellowish, bearing hairs on surface and 

 longer hairs along margin. 



Female. — Face bearing two slender setae; hind femur without 

 longer ventral setae. 



Type-data. — Holotype cf from Mexico; Hidalgo, near Chapulhua- 

 can, on wet rock face above roadside spring, Aug. 5, 1962, H. Robinson 

 (USNM 69439). Allotype 9: San Luis Potosi, a few km south of 

 Tamazunchale, on moist limestone in small ravine, Aug. 4, 1962, 

 H. Robinson. Paratypes: same locality as holotype, Aug. 5, 13, 10 

 c^; same locality as allotype, Aug. 4, 5, 2 9; all in 1962, collected by 

 H. Robinson. 



