Malloplwi^a from Birds of Coshi Rica, Central America 19 



.57 mm., width .48 mm.; abdomen shorter, nearer a perfect oval; 

 ninth segment flatly rounded, with a fringe of long hairs; eighth 

 segment with only a narrow brown band around anterior margin, 

 lateral bands absent ; genital hooks short, stout, and curving at 

 tips. 



Numerous males and females collected on Zarhynchns ivaglen 

 at Juan V^inas, Costa Rica, March, 1902. This is a very striking 

 and beautiful form, something like the type of A^ ornatissimiis 

 Gieb!, a type found on many Ictcridac. 



Nirmus melanacocus sp. nov., pi. II, fig. 6 



Female. — Body, length 1.65 mm., width .46 mm., very pale 

 testaceous, almost clear, except the head, which is translucent 

 brownish, with pitchy antennal and templar bands; abdomen 

 clavate, witli pitchy lateral bands and brownish, median, trans- 

 verse bands. 



Head, length .38 mm., width .39 mm. ; almost an equilateral 

 triangle, with slightly convex sides and truncate occipital mar- 

 gin : clypeus narrowly truncate; trabeculae small, colorless; an- 

 tennae of medium size, pale testaceus, second segment the long- 

 est, third and fourth equal ; eye liatly convex, colorless, with a 

 small bristle; angles of temples almost square, with one slender 

 hair ; heavy pitchy brown antennal bands not quite reaching the 

 clear oral fossa, with the fossa bending inward slightly at the 

 trabeculae; mandibles long and slender, chestnut; temples mar- 

 gined laterally with narrow pitchy bands, connected with the 

 antennal bands by pale brown bands ; whole head, except oral 

 fossa and region enclosed between the pale occipital bands, an 

 even clear brown ; a large, deep brown occipital signature. 



Prothorax small, quadrangular, with convex sides and a single 

 weak hair in posterior angles; broad pitchy brown lateral bands, 

 curving around on posterior margin ; coxal bands visible. Meta- 

 thorax larger, pentagonal, with convex, diverging sides, and 

 sharply angulated posterior margin, having five weak hairs on 

 each side ; a pitchy brown spot in anterior angles, connected with 

 lateral bands of prothorax ; pitchy brown transverse blotches in 

 region of posterior angles ; coxal lines visible, interior of segment 



141 



