610 PROCEEDINGS OF THE ACADEMY OF [NoV., 



as long as others together, tibia I ahnost as broad as the femur. 

 Pronotuin only slightly rugose, broader in front than behind, much 

 wider than long. Fore wings with about 8 costals, and two or three 

 beyond subcosta, two branches of radial sector, three median and 

 three cubital cross-veins; in hind wings the anal fork has only one 

 branch. Expanse 20 mm. 



From Mallali, British Guiana, March (Parish). 



Neoperla plutonis n. sp. PI. XXVIII, fig. 10. 



Large black species. Head yellow, a large, broad, blackish spot 

 over ocelli extending to the anterior bosses, and reaching laterally 

 toward eyes. Antennae and palpi blackish; pronotum black on sides, 

 pale in middle; thorax brown; abdomen pale on base, dark at tip, 

 setae yellow brown; legs brown, basal tarsal joints pale, blackish at 

 tips of femora and on bases and tips of tibiae. Wings blackish, 

 veins (except costal) dark. Ocelli a little more than their diameter 

 apart, not one-half their diameter from the bosses, which are larger, 

 transverse, and not their length from the eyes; third joint of max- 

 illary palpi much longer than the fourth; last tarsal joint fully three 

 times as long as the others together, tibia I not one-half as wide as 

 the femur. Pronotum much broader than long, sides rounded, 

 surface rugose. Wings large, about 15 costal cross-veins, four 

 beyond end of subcosta; three or four branches of radial sector; 

 10 median and 7 cubital cross-veins; in the hind wings the anal 

 fork has four branches; anal plate of female broad, emarginate 

 behind. Expanse 56 mm. 



From La Trinidad, Turricares, and Orosi, Costa Rica (Garlepp). 



Neoperla nigriceps n. sp. 



Head and pronotum nearly shining black, sides of pronotum very 

 narrowly pale, thorax and abdomen brown, antennae and setae pale 

 yellowish, basal joint of the antennae partly dark; wings brown, 

 veins scarcely darker; legs pale, tibia and apex of femur H brown. 

 Last joint of palpus long and slender. Head bent down, eyes very 

 prominent, ocelli very small, about three diameters apart, twice as 

 far from the eyes, lateral bosses no larger than ocelli, much lower 

 down, and fully their length from the eyes and twice as far from 

 ocelli. Pronotum fully one and a half times as broad as long, much 

 broader in front, corners rounded, surface rugose; last joint of tarsi 

 three times as long as others together. Wings slender, costals few 

 and weak, radial sector forked once (nearer anastomosis than to tip), 

 7 median and 7 cubital cross-veins. Expanse 15 mm. 



