CRYPTUS. MESOSTENUS. 231 



CRYPTUS, Fabr. 



1. Cryptus ferrugineus. 



Female. Length 5 lines. — Ferruginous, shining and impunctate ; 

 wings hyaline and iridescent, the nervures and stigma black ; their 

 apical margins narrowly fuscous, with a dark fuscous macula at the 

 apex of the marginal cell and extending beyond it ; antenna; black, 

 two or three of its basal joints ferruginous beneath ; the posterior 

 tarsi black ; the metathorax very smooth and shining, truncate, 

 with the margin of the truncation acute and laterally subdentate. 

 The apical margins of the abdominal segments slightly constricted ; 

 the ovipositor black, and about half the length of the abdomen. 



Hab. Costa Rica, Cache. 



2. Cryptus bicolor. 



Female. Length 5 lines. — Head and thorax black ; abdomen ferru- 

 ginous ; wings fuscous, with a violet iridescence. Thorax semi- 

 opaque, the scutellum shining ; the metathorax finely rugulose, 

 posteriorly truncate, the margin of the truncation acute and slightly 

 raised, laterally produced into a small tooth. Abdomen smooth and 

 shining ; the first segment petiolated, expanding into a quadrate 

 shape, its anterior angles dentate. 



Hab. Costa Rica, Irazu. 



MESOSTENUS, Grav. 



1. Mesostenus nigerrimus. 



Female. Length 6 lines. — Jet-black, with the abdomen shining. 

 The antennae with the apex of the fifth and the seven following 

 joints white above ; the mesothorax longitudinally striated on the 

 disk ; an elevated carina runs from the anterior wings obliquely to 

 the scutellum, which is elevated into a conical tubercle ; the meta- 

 thorax is rugose behind and has a longitudinal striation at the base, 

 and on each side has a blunt tooth or tubercle ; the anterior wings 

 with a large dark fuscous cloud in the middle, the apex also fuscous. 

 Abdomen with the two first segments very smooth and shining, the 

 rest with a fine grey pile. 



Hab. Costa Rica, Cache. 



