The presence of the ventral paired organ related the subgenus 

 Carlos to the subgenus Chiropterargas and separates Carlos from 

 the subgenus Argas and from other subgenera. The presence of a 

 lateral suture and of peripherally differentiated integument, 

 and the absence of EUi appendagelike hood clearly separates the 

 subgenus Carlos from the subgenus Chiropterargas . 



The name vespertilionis was assigned by Latreille in 1802, 

 not in 1796 as stated by most authors. The reference to this 

 name as of 1796 (Hoogstraal 1955B) derives from an editorial 

 change . 



Schulze (19^3B) noted that the iramattire stages of species 

 of this group ('"A, pipistrellae "' ) have especially highly devel- 

 oped terminal brancning of midgut diverticula but little basal 

 branching. 



IDENTIFICATION 



Males and females are alike except that males average some- 

 what smaller in size arid their genital aperture is semicircular 

 in outline, rather than narrowly ovoid, and is not bounded by 

 thickened rugose lips as in females. 



In both sexes and in nymphs, a definite latersil suture en- 

 circles the body, a dorsal and ventral row of rectangular "cells" 

 marks the body periphery, no appendagelike hood is present over 

 the raouthparts, but ventral paired organs are present just pos- 

 terior of the anus. 



The body outline is generally circular or subcirciolar, but 

 may be somewhat longer or wider in some specimens. Few individuals 

 reach six millimeters in length or breadth. The integument is 

 smooth, marked by a fine network of small, irregular cells among 

 which regular, subparallel rows of larger discs radiate. 



Legs arise from the anterior half of the body aM are short- 

 er than the body; coxae are contiguous; and tarsi are tapered 

 and lack dorsal humps . 



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