144 Psyche [August 



(Collection Nos. A-733 and A-761), and Dr. Wheeler's specimens 

 have been compared directly with these. The specimens from 

 lots No. 76 and No. 164 are entirely comparable with the topo- 

 type specimens except for their slightly larger size. The speci- 

 mens from lot No. 87 average smaller in size and tend more 

 towards a circular shape. The morphological characters, with the 

 exception of some minor differences in the shape and extent of 

 the various chitinized areas, as the collar sm-rounding the anal 

 plates, appear to be identical within the limits set by a slight 

 allowance for individual variation, in all the specimens examined. 



In addition to the British Guiana records, the writer has 

 collected this species in the grounds of the Department of Agri- 

 culture, St. Clair, Port-of-Spain, Trinidad, Nov. 23, 1918 beneath 

 the bark of Ficus (ulmifoUaf) (A-1046), inside the hollowed-out 

 twigs of a large tree of Pithecolohium saman (A-1047), and 

 finally on an unknown tree (A-1059), in each case attended by 

 ants. 



Some additions to Prof. Newstead's original description 

 may be noted to advantage as aids to the recognition of the 

 species: The claw digitules are present, thread-like, curved, not 

 quite reaching the tip of the claw: the heavy collar at the mar- 

 ginal end of the spiracular complex normally bears two stout, 

 tapering, blunt-tipped, widely separated spines of small size 

 on the outer margin, but these are frequently broken off and 

 the spine base is so placed as to make its recognition very difficult 

 when the spine is missing; the marginal spines are fairly stout, 

 tapering, faintly lanceolate; each anal plate beai-s from 10 to 

 15 setse dorsalty, one apical, two subapical, and the remainder 

 scattered over the surface; there are four ventral ridge and four 

 fringe setse, the latter in two pairs on the edge of the membranous 

 fold beneath the plates; all setse of the anal plates are slender 

 and of moderate length; anal ring small, with a few large pores 

 and ten setse; the ventral multilocular disk pores are quite 

 numerous beneath and behind the anal plates and over the 

 posterior portion of the ventral surface, especially near, but not 

 quite at, the body margin, up to the posterior spiracles, but 

 anj^ transverse rows across the middle of the abdominal segments 



