CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 517 



Key to the subgenera of Cyrtomenus 



1. Mesopleural evaporatorium posteriorly interrupted by shining, submarginal 



band Syllobus (p. 517) 



2. Mesopleural evaporatorium entire (fig. 109) Cyrtomenus (p. 525) 



Subgenus Cyrtomenus (Syllobus) Signoret, new status 



Syllobus Signoret, 1879, p. clxxiii. 



Diagnosis. — This subgenus is best identified by the posterior, 

 submarginal interruption of the mesopleural evaporatorium as 

 described in key to subgenera. 



Description. — Size usually larger, 8.99-13.95, but marginalis 

 measures only 7.07 (known only from type female). Juga rounded 

 and equalling or surpassing clypeus or triangularly produced apically 

 and contiguous in front of it. 



Pronotum: Laterally with 10 to 25 setigerous punctures submargin- 

 ally; of males with a large, shallow, subapical, somewhat cruciform 

 impression. 



Sternites: Polished; submarginal or median rows of setigerous 

 punctures on segments I to III, usually with small or moderate setae 

 arising from them. 



Legs: Posterior tibia not or but gradually and little expanded 

 toward apex. 



Type of subgenus. — Cyrtomenus emarginatus Sih\ (1862, p. 95), 

 monobasic. 



Distribution. — The known range extends from Mexico south 

 through the northeastern part of South America to southern Brazil; 

 this being a more or less central part of the range of the entire genus. 

 The Florida record for emarginatus by Torre Bueno (1939) requires 

 confirmation, and at best probably represents only an adventive 

 specimen. 



Discussion. — Of the four species belonging to this subgenus, 

 two — emarginatus and marginalis — are well marked. The former is 

 strongly characterized by the remarkable, triangular projections at the 

 apices of the juga, and marginalis by the much more numerous setae 

 on the sides of the pronotum and costa. The other two species, teter 

 and grossus, are very closely allied to each other, but appear distinct 

 on the basis of external features as well as on the shape of the 

 gonostyli. 



Key to species of subgenus Cyrtomenus (Syllobus) 



1. Costa with 20 or more setigerous punctures . . marginalis Signoret (p. 521) 

 Costa with not more than 10 setigerous punctures 2 



2. Apices of juga projecting as blunt to acute triangles (fig. 58) . 



emarginatus St&l (p. 518) 

 Apices of juga rounded, not projecting triangularly 3 



