508 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lOB 



close to 3d r which is below pterostigma to R2+3; 2d m between MA 

 and MPl+2 almost directly under 1st r-m; three radiomedial cross- 

 veins; inner gradates in slightly irregular series, outer gradates in 

 regular series, including a sectoral cross-vein. 



Hind WING (pi. 2, fig. 6): Length approximately 3.4 mm.; width 

 1.3 mm.; membrane pale yellowish, with indistinct antepterostigmal 

 spot just before pterostigma, which is yellow, outlinmg ends of Sc 

 and E.1 at theu' point of coalescence; venation pale except for 1st r, 

 short section of Rs before coalescing with MA, which are brown, 

 with the margin of 1st A and the free piece of MA slightly dark also; 

 Rs forking into R2 + 3 and R4+5 basad of point of coalescence of Sc 

 and Rl; two branches of Cul to margin; two radial cross-veins with 

 1st r just before the R2+3 fork, 2d r before terminal fork of R2; six 

 outer gradates. 



Female genitalia (fig. 23, b): Eighth tergite of almost uniform 

 length throughout width; ninth tergite with each latero ventral half 

 considerably elongate, anterior width approximately one-third and 

 posterior width one-fourth of length, dorsal margin slightly sloping 

 posteroventrally, ventral margin almost straight, curving postero- 

 dorsally to articulation point; tenth tergite considerably shorter 

 dorsomedially. 



Holotype: a female (in glycerin-filled vial) from Bartica, British 

 Guiana, December; MCZ 11935. 



The holotype is broken, with one part consisting of the head (with 

 the antennae beyond the basal segments missing), the prothorax 

 and mesothorax including left forewing (mesothoracic left leg and 

 tibia and tarsi of right broken off), another part of the metathorax 

 with the left hindwing (left metathoracic leg broken off) and a por- 

 tion of the abdomen. The right wings are mounted on two separate 

 slides. 



This specimen was also apparently collected by H. S. Parish in 

 1912 when he visited Bartica at about the same time he collected 

 basalis, although the collector's name is not found on the label at- 

 tached to the pin (see p. 507). It was apparently originally described 

 by Banks from a unique specimen. 



In the Cornell University collection there is also a female, with the 

 following data: *'Zanderij 1, Boven Para District, Surinam, April 24, 

 1927, Cornell U, Lot 760, Sub. 38." This specimen has the antennae 

 beyond the basal two antennal segments blackish brown and slightly 

 paler apically. 



This species was collected in the two adjacent countries, British 

 Guiana and Surinam. It is readily distinguishable from basalis 

 through its transverse radiomedial streak and antepterostigmal spot, 

 and its even longer lateroventral halves of the ninth tergite in com- 

 parison with the width. 



