314 BULLETIN: MUSEUM or COMPARATIVE ZOOLOGY. 



The radial sector and median are connected by a cross-vein, the apical branches 

 are not short and crowded as in the other species of the genus, but like Caecilius, 

 the areola postica is very small and short, and the stigma of moderate length, 

 rounded behind. 



Length, to tip of wings 3 mm. 



I place parculus in this genus on account of the separation of radial 

 sector and median vein and the structure of the head, but the rest of 

 the venation and the antennae are like Caecilius. The D. dolobratus 

 Hagen is a Caecilius very close to C. himaylamis Enderl., besides the 

 types I have dolobratus from Singapore and Island of Penang. 



CALOPSOCUS IRIDESCENS, sp. nov. 

 TYPE. M. C. Z. 10,783. Borneo: Sandakan (C. F. Baker). 



Head brown; thorax and abdomen dark brown; legs brown, anterior tibiae 

 and tarsi rather paler. Wings deep black, iridescent blue in certain lights. 

 Vertex, seen from in front, broadly, but not deeply, concave (not narrowly 

 incised as in C. infelix). Wings proportionally longer than in C. infelix, and 

 densely reticulately veined, even from before the middle to near the outer edge. 



Length of wing 4 mm. 



PERLIDAE. 



ISOGENUS HASTATUS, Sp. nOV. 



TYPE. M. C. Z. 10,820. N. C.: Andrews, middle of May (F. 

 Sherman). N. H.: White Mts. (E. P. Austin). 



In many ways similar to I. frontalis but darker, especially the wings. The 

 head has the posterior yellow spot continued into a hastate mark between the 

 posterior ocelli, a pale spot each side on lower face. The seventh ventral 

 segment is slightly convex in the middle and there orange in color, the following 

 segments have apical margins narrowly orange, and the basal segments are 

 pale on tips. The ocelli form a triangle nearly equilateral, and the wings have 

 no cross-vein from near tip of radial sector to radius, otherwise much as in 7. 

 frontalis. 



Expanse 36 mm. 



Although differing in venation the genital characters are so similar 

 to those of Isogenus that I include it in that genus as Dr. Hagen had 

 done in the collection. 



