192 NEOTROPICAL PSELAPHIDAE 



femora not abnormally swollen. All tibiae pubescent in apical fifth at ventral 

 face. 



Allotype Female. Similar to holotype and paratypes save that (1) the 

 declivous frontal area is slightly tumid and not scabroid; (2) antennae not 

 abnormally formed; (3) intermediate femora simple; (4) first visible sternite 

 not quite so produced and fourth sternite relatively longer. 



Described on six specimens all collected by the author at lights between 

 9 and 11 p.m., on Barro Colorado Island, Gatun Lake, Panama Canal Zone, 

 in July, 1936. Male paratype (July 14), male paratype (July 16), male holo- 

 type and female allotype (July 17) at island laboratory; two male paratypes 

 (July 8) at Burrunga Point. 



This is a clearly defined species. In antennal abnormality it approaches 

 torticorne Raffray and nanum (Schaufuss) of Brazil. In complexity of male 

 intermediate femora it approaches coniplicatum Fletcher of Guatemala. This 

 large sixth group of the genus would seem to have a Brazilian and a Mexican 

 focus, with the two rather satisfactorily united by coniplicatum and chichion 

 of Central America. 



Key to the Males of Group VIII 



Head strongly narrowed anteriorly ; vertexal f oveae united by oblique 

 sulci which unite near the frontal margin; intermediate femora with 

 inflated dorsal area ending in an unspined obtuse angle, a long and 

 narrow sinuate sulcus arising on posterior face from just below this 

 angle and extending ventro-apically to apical eighth, the sulcus hold- 

 ing at its dorso-basal end a spine; length 1.3-1.4 mm.; known only 

 from Grenada, Windward Islands spinosum 



Head slightly narrowed anteriorly to square; males with the inter- 

 mediate femora otherwise modified; not known from the Antilles. . 2 



2. Head square with a flattened vertex; known from Brazil and Argen- 



tina 3 



Head with occipito-vertexal area convex to tumid; known from neo- 

 tropics north of Brazil 4 



3. Intermediate tibiae with a small, apically directed spine at four-fifths; 



antennal segments II-V subquadrate and subequal, VI-VII slightly 

 smaller, VIII larger and transverse, IX much larger and slightly 

 transverse; anterior femora with dorso-posterior face with a trans- 

 versely oval, lightly punctulate, well-defined area; intermediate 

 femora with dorsal excavation in apical half, with a very large, 

 slightly recurved and blunted spine at basal end of excavation, floor 

 of excavation deeply notched on posterior face near apical end of 

 excavation; 1.7 mm. long; known only from Argentina, .rubripenne 

 Intermediate tibiae without tibial spine on ventral face at apical four- 

 fifths ; spine at basal end of excavation of intermediate femora much 

 smaller; vertexal f oveae very shallow and superficial; known only 

 from Brazil externedens 



