100 NEOTROPICAL PSELAPHIDAE 



seventh sternite, these valves swinging ventro-laterally to allow extrusion of 

 the male copulatory organ. The male sternites are variously secondarily modi- 

 fied by trichomoid setae, fossae, carinae, foveae, et cetera, and are rarely 

 perfectly simple and convex. The male legs may be variously modified. 



The number of basal elytral foveae, the shape and extent of the pronotal 

 discal fovea, and whether or not the vertexal foveae are nude or pubescent, are 

 important characters, so that the genus does not lack taxonomic scope. 



Key to the Known Males (incomplete) 



Fourth sternite with a transverse fossa or f oveoid depression 2 



Fourth sternite without such a transverse depression 3 



2. Head slightly wider than pronotum inhonestus 



(1.4-1.5 mm.; each elytron with three basal foveae; Colombia) 



Pronotum slightly wider than head illepidus 



(1.4 mm.; Grenada, Windward Islands) 



3. First antennal segment cylindrical; second antennal segment ovate; 



pronotal discal impression free and ovate insularis 



(1.4 mm.; Guadeloupe, Leeward Islands) 

 First and second antennal segments quadrate; pronotal discal impres- 

 sion elongate-oblong, sulcoid exiguus 



(1.0 mm.; St. Vincent, Windward Islands) 



Tentative Key to the Seven Species Ascribed 

 Lateral pronotal margins not sinuate toward base, and not having a 



tubercle or a tooth at the level of the lateral fovea on each side .... 2 

 Lateral pronotal margins slightly sinuate toward base, and each side 

 with a small tubercle or tooth at the level of the lateral pronotal 

 fovea 3 



2. Known from the female sex only, and only from Venezuela, .signifera 



(Size?; each elytron with three basal foveae) 

 Known from the male sex only, and only from the Lesser Antilles 



eonguus 



(See male key) 



3. Impression of pronotal disc in the form of an elongate sulcoid depres- 



sion which extends to the median subbasal fovea of the pronotum. . 4 

 Impression of pronotal disc variously shaped (sulcoid, foveoid or 

 ovate) but free, that is, not joining the median subbasal fovea of 

 the pronotum 5 



4. Known only from Guatemala guatemalenus 



(1.5 mm.; female?; Duenas, Guatemala) 



Known only from Lesser Antilles illepidus 



(See male key) 



5. Head with the longitudinal sulci, arising in each case from a vertexal 



fovea, connected anteriorly behind the frontal margin by a well- 

 developed transversely arcuate sulcus 6 



