50 M. A. Carrikcr 



nine unifonnly brown except the tip of the ninth, which is clear-; 

 tip of ninth with two longish liairs and a fringe of fine hairs, 

 also a few short hairs along the lateral margins ; on the ventral 

 snrface is a transverse row of stout hairs across the posterior 

 margin of the eighth segment, and a short row of stiff bristles 

 in the lateral portions ; also a fringe of stout marginal hairs 

 along the anterior portion of the eighth, curving upward around 

 the sides of the segment. Legs of medium length and stout, 

 especially the anterior pair; smoky brown the same as the head, 

 with heavy, deep brown anterior borders on the femora and 

 tibiae. 



A single female collected from Gypagits papa, at Pozo Azul, 

 Costa Rica, June, 1902. This form is of the same type as 

 scfosniii Piag., from which it is distinguished by the absence of 

 transverse bands on the first two segments of the abdomen, by 

 the much narrower lateral bands on segments four to seven, by 

 the presence of transverse bands on segments four to eight, by 

 the presence of a continuous fringe of hairs on the posterior 

 margin of all the abdominal segments, and by the much shorter 

 hairs on the posterior angles of the abdomen. 



Colpocephalum osborni Kell. var. costaricense var nov. 



A large number of males and females collected from Bntco 

 boreal is costaricensis, on the volcano Irazu, Costa Rica, April, 

 1902. While these specimens resemble quite closely Kellogg"s 

 vsbonii, there are sufficient important differences to give them 

 a varietal rank. This form is larger, measuring: female, length 

 1.70 mm., width .56 mm.; head, length .31 mm., width .47 mm.; 

 male, length 1.57 mm., width .49 mm.; head, length .31 mm., 

 width .46 mm. ; the pitchy lateral spots are absent from the first 

 and second segments of the abdomen; there is a dusky trans- 

 verse band across the metathorax ; the pitchy spots of the head 

 are not so closely united, while the marginal bands of the legs 

 are paler. 



With these exceptions it agrees with Mr. Kellogg's descrip- 

 tion of the species. 



172 



