CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 525 



Subgenus Cyrtomenus (Cyrtomeniis) Amyot and Serville 



Cyrtomenus Amyot and Serville, 1843, p. 90. 



Diagnosis. — The uninterrupted mesopleural evaporatorium will 

 satisfactorily distinguish this subgenus from Syllabus. 



Description. — Size moderate; length of body, 6.4-8.6. 



Head: Juga rounded, equalling, longer than, or surpassing clypeus 

 and contiguous at apex of clypeus. 



Pronotum: Laterally with 4 to 12 setigerous punctures; males and 

 females usually with similar, vague, subapical, median impression. 



Sternites: Polished; I and II and sometimes others with submar- 

 ginal row of setigerous punctures giving rise to long, golden setae. 



Legs: Posterior tibia moderately to strongly compressed and often 

 strongly expanded in apical third. 



Type of subgenus. — Cyrtomenus castaneus Amyot and Serville 

 (1843, p. 91), subsequently designated by Kirkaldy (1903, p. 230). 

 This name is here considered as a synonym of Pentatoma ciliata 

 Palisot de Beauvois which becomes Cyrtomenus ciliatus (Palisot de 

 Beauvois) as the proper name for the common North American species 

 which has long but erroneously gone under the name "Cyrtomenus 

 mirahilis (Perty)." A lengthier discussion of this problem is presented 

 under C. ciliatus (p. 532). 



Distribution. — The species of this subgenus occupy the area from 

 eastern and central United States south through Central America and 

 the West Indies into South America to central Argentina; i.e., the 

 full range of the genus. 



Discussion. — The four species of this subgenus can be grouped in 

 several ways by different sets of characters. If just the degree of 

 dilation of the posterior tibia is considered (which may have signif- 

 icance in burrowing forms), the two very closely allied North American 

 species separate from the other two, as follows: 



Posterior tibia as broad as anterior tibia: ciliatus (Palisot de Beauvois) 



crassus Walker 



Posterior tibia narrower than anterior tibia: mirahilis (Perty) 



hergi, new name 



But if the greater convexity of the body, the more strongly rugose 

 head and the larger ocelli are contrasted with the less convex body, 

 the flatter, smoother head, and the smaller ocelli, the arrangement 

 would be like this : 



Greater convexity; rugose head; large ocelli: ciliatus (Palisot de Beauvois) 



crassus Walker 

 mirahilis (Perty) 



Less convex; smoother head; small ocelli: hergi, new name 



