424 



vex. apex rounded, dorsal edge subangularly produced on apical half, 

 from near base a curved, flattened spine arises. 



Length ^-7 mm. ; tcgmcn 8.5 mm. 



Hal). Bartica, British Guiana, ]\rav, 1901. Described 

 from one male specimen. Type in coll. Prof. H. Osborn. 



M. nconchuJosa sp. nov. 



$ Similar to M. nchulosa as recognized above but the bands on teg- 

 mina fainter and narrower. Pygophor very short, edges entire ; anal seg- 

 ment subquadrate, about as long as wide, sides very slightly convex, 

 apex truncate or slightly concave, anus near middle, a carina runs from 

 each side of anus to apical edge ; genital styles broadest at apex, ventral 

 edge slightly curved, apex slightly convex, dorso-apical corner angular, 

 ventro.apical corner round, dorsal edge concave, from the middle arises 

 a curved spine with a rounded apex. 



Length 3 mm. ; tegmen damaged. 



Ilab. Bartica, British Guiana, July, 1901. r)escril)e(l 

 from one male with damag'ed tegmina. Type in coll. Prof. 

 H. Osborn. 



M. % 



sp. nov. 



9 I have one female specimen with immaculate tegmina with the 

 antennae longer than the face and the arista arising one-third from 

 ape.x ; the genital styles (ovipositor sheath) are abortive but the ovi- 

 positor is well developed and exposed. I refrain from naming from only 

 a female. 



Ilab. Bartica, British Guiana, April, 1901. 

 il/. sp. nov. 



9 Orange-buff, veins of tegmina and wings slightly darker than mem- 

 brane, posterior margins of tegmina and wings bordered with fuscous. 

 Posterior edge of pregenital plate produced in middle into a quadrate 

 plate slightly longer than wide ; styles small, covering ovipositor. 



Lengtli 3.4 nun. ; tegmen 7.8 mm. 



Ilab. Bartica, British Guiana, ]\lay, 1901 {Co]]. Jl. S. 

 Parisli). I refrain from naming only a female. 



