42;} 



ilf. nehulosa (Germ.). 

 I have specimens from Bartica, British Guiana, which a^ree with the 

 descriptions of this species. The male pygophor sliort, mostly hidden 

 within preceding segment, ventral edge straight, a tliin i)rojection from 

 cacli lateral edge beside the anal segment ; anal segment sliort. base 

 hidden within pygophor, portion beyond anus roundly bilol)ed, a ridge 

 rumiing from each side of anus along each lobe to medio-apical edge ; 

 genital styles large, ventral edge curved, more strongly so on apical half, 

 dorsal edge straight, a little beyond the middle there is a process point- 

 ing inward, flat, sub-quadrate, longer than broad with its truncate apex 

 oblique, its plane at right angles to the plane of style. 



9 The female I associate with the above has a very short anal 

 segment sunk within the preceding segment, the styles are fiat, subconical, 

 somewhat longer than width of base, broadest at base and rounded on 

 basal inner margin ; ovipositor very small. 



i¥. costata ? (Fahr.). 



This agrees with the descriptions and tiiiure of cosfula. 

 There is a l)rown spot on each lateral portion of the proiinnnii, 

 tegnlae dark. 



$ Pygophor very short, ventral edge entire, lateral edges roundly 

 produced in middle and turned inward, the produced portion can only 

 be seen when the genital .styles are widely parted ; anal segment about 

 as long as broad, subovate, the lateral edges slanting downward, ape.x 

 with a small emargination, anus at base, a keel runs from each side of 

 anus to near apical margin ; genital styles large, narrow at base, widest 

 in middle, apex rounded, ventral edge slightly convex and the rim 

 slightly thickened, dorsal edge subangularly produced in middle, the 

 margins being slightly concave, near base there arises a curved spine, 

 rounded and slightly flattened at apex, a keel runs from base to near 

 apex down the outer surface. 



9 Pregenital plate much wider than long, posterior edge medially 

 produced into a subtriangular lip ; styles and ovipositor abortive, the 

 latter appearing as two small curved spines, genital area arcuate along 

 the dorsal margin, the ventral margin formed by the pregenital plate ; 

 anal segment about middle, very short. 



Hab. Three specimens from Bartica, British (iniana, 

 April and Jnlv, 1901. 



M. pscudonchidosa sj). nov. 



(5 This differs from M. ucbiclosa as recognized above bv the geni- 

 talia. Pygophor very short, ventral edge entire, lateral edges produced 

 into a large, curved, flattened spine beside the anal segment ; anal seg- 

 ment longer than wide, subconical in outline, apex with angular emargi- 

 nation, anus near base, a keel runs from each side of anus to ape.x at 

 each side of emargination; genital styles large, ventral edge slightly con- 



