422 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



Body with very sparse, short, appressed yellowish pilosity. 



Head not granulosa. Interantennal spine not developed. 



Thoracic segments do< granulate; lengths of segments: 3.4, 4.2, 1.4 

 nun. Anterior half of prothorax distinctly stouter than posterior 

 (fig. 82). Armature of forefemur with inner row consisting of short 

 spines of Dearly uniform length alternating with fine longer setae. 

 (.Maws of foretarsi two, the inner short and closely appressed to base 

 of outer. First spine of forefemur at two and one-half times its 

 length from tip of trochanter. Basal half of forefemur thickened 



gradually to first spine. 



Abdomen with bulbous swelling. Abdomen gradually widening to 

 middle of fourth segment. Apieal half of fourth segment widening 

 and forming minor part of bulbosity. Fifth segment forming widest 

 part of bulbosity. equal in length to sixth, tergum with angulate 

 ridged elevations on lateral sides. Basal two-thirds of sixth segment 

 forming part of bulbosity, lateral angles slightly projected laterally. 

 Seventh tergum narrowing on basal third, narrowest portion parallel 

 sided to over apieal two-thirds, apieal third tapering to a sharp point; 

 apex not surpassing claspers, transversely corrugate (tig. 33). Terga 

 each with wartlike elevation on hind margin. Hind margins of 

 second to fifth sterna straight; of sixth shallowlv concave medianly 

 anil convex on sides; o( seventh and eighth sterna shallowly and 

 broadly concave; eighth sternum visible its entire width. Hypo- 

 pygium opening upwards; claspers longer than wide, on lateral 

 aspect with an angular elevation near middle of upper margin, lower 

 margin with an angular indentation near middle, upper margin as 

 seen from behind with a U-shaped notch before apex. Upper apieal 

 margin of hypopygium with a very large hook; broad base of hook 

 projecting eaudad. the more slender apical half standing clear from 

 the base, the apex hidden by the claspers, and with a shallow furrow 

 above near apex (fig. 25). 



Overall body length 23 mm. 



The shape of the hook o( the hypopygium of this species as well as 

 the combination of characters separate this species from others with 

 such a hook. The shape o( the basal half of the hypopygial hook is 

 slightly different in the paratype; in the paratype it is stouter and 

 shorter than in the holotype; otherwise, the two specimens are quite 

 similar. 



Types: Holotype. male, Rio Reventazon, Costa Rica, April 30, 

 1908, V. Reimoser collector, Vienna Museum. Paratype, male, Costa 

 Rica, no other data, author's collection. 



