no. 3615 HARMSTONIA — ROBINSON 9 



to elliptical with the surface glabrous. The group contains the 

 following four species. 



Harmstonia megalopyga, new species 



Figure 8 



Male. — Length 1.60 mm; wing 1.60 mm by 0.57 mm. Face very 

 narrow but distinct to the mouth, whitish pollinose; front grayish; 

 antennal segment 3 short, truncate with lower corner slightly pro- 

 duced. Legs brown to blackish; middle femur with preapical, hind 

 femur with preapical often preceded by second smaller seta and with 

 row of distinct setae along anteroventral surface; foretibia with five 

 to six slender anterodorsals, middle tibia with a large anterodorsal and 

 a large posterodorsal near basal third, hind tibia with eight or more 

 slender posterodorsals, tibiae without distinct apicals; lengths of 

 segments of foretarsus from base as .25-.12-.06-.06-.08 mm, basitarsus 

 with about five slender erect setae below; middle tarsus as .23— .11— 

 .08-05-07 mm; hind tarsus as .17-.21-.11-.08-.08 mm. Tips of 

 wing veins 2 and 3 are 1% times as far apart as tips of veins 3 and 4, 

 veins 2 and 3 curved slightly back distally, vein 4 curved slightly for- 

 ward and becoming parallel with vein 3 distally; cross vein \Y% to 

 1% times as long as last of vein 5; knob of halter fuscous yellow. 

 Hypopygium (fig. 8) ca. .65 mm long; hypopygial lamella elliptical 

 from a tapered base, pale and nearly hyaline, outer or lower margin 

 bearing a fringe of long setae, a pair of large black marginal setae from 

 near base, cucullate tip of lamella with a small included appendage. 



Female. — Face bearing four to six rather strong setae, rarely only 

 three; hind femur without distinct setae below. 



Type-data. — Holotype d 1 and allotype 9 from Mexico: San Luis 

 Potosi, small ravine a few km south of Tamazunchale, on surface of 

 moist limestone, Aug. 4-5, 1962, H. Robinson (USNM 69435). 

 Paratypes: same data as holotype, 2 cf and 4 9; Chiapas, Ixtapan, on 

 moist limestone at roadside above river, May 23, 1963, H. Robinson, 

 1 <? and 3 9. 



Notes. — The species is the largest known in the genus. In addi- 

 tion, the hypopygium is disproportionately large. 



The elliptical cucullate hypopygial lamella as seen in this group 

 seems homologous to the inflated basal area evident in most of the 

 species of Group I. The small included apical lobe found in the H. 

 megalopyga group seems homologous to the apical part of the lamella 

 that is prominent in the species of Group I. 



248-446—67 2 



