72 NEOTROPICAL PSELAPHIDAE 



ANARMODIUS (Raffray, 1890) 



Six visible sternites in male and female; male with femora more inflated, 

 and the anterior femora tuberculate. 



Key to the Species 



Each elytron with three basal foveae gibbus 



Each elytron with two basal foveae bifoveatus 



gibbus (Schaufuss). 1872. Brazil. {Trichonyx) Genotype. 

 bijoveatus Raffray. 1891. Venezuela. 



FLETCHEREXIUS new genus 



This genus is erected primarily for Eurhexius macrodactylus Fletcher 

 (1928). It appears to be more closely related to the eurhexiforms with edentate 

 pronotal margins {Anarmodius, Aporhexius, Rhexinia) than to the genera 

 having dentate margins {Xherius and Eurhexius as limited here), but war- 

 rants isolation on the remarkable tarsal claws, length of the eleventh antennal 

 segment, pronotal outline and elytral foveae. 



Macrodactylus was described on three doubtfully male specimens col- 

 lected in 1925 from decaying log mold of Abies religiosa, between 3000 and 

 3200 meters near Mexico City. 



Salient structural features are the shining punctate-granulate integument; 

 transverse head, but slightly narrower than pronotum; very small, oval eyes; 

 medianly placed vertexal foveae; a small, deep fovea behind each antennal 

 tubercle; occiput with a median longitudinal sulcus which passes forward to 

 just anteriad of the vertexal foveae; antennae eleven-segmented with segments 

 III, IV and V small and moniliform, VI, VII and VIII slightly increasingly 

 transverse, the XI slightly longer than VIII, IX and X combined. Ventral 

 surface of head with capitate setae. Pronotum distinctive. I examined a para- 

 type of macrodactylus in the National Museum (U.S.N.M. No. 44612) and 

 found the lateral pronotal outline (PI. VIII, 11) to strongly suggest our North 

 American Rhexidius (PI. VIII, 1), These outlines are subentire, widest slightly 

 posterior to the middle of the pronotum, strongly convex anterior of this point, 

 ending in a rounded obtuse apex, and slightly sinuate posterior to this widest 

 point to the subtruncate base with rounded posterior angles ; the lateral margin 

 in the basal third granulated so that, under high magnification the margin 

 gives the impression of being composed of about five very minute, blunted 

 denticles; median longitudinal sulcus deep and extending from basal margin 

 to apical sixth; transverse pronotal sulcus in basal third, crossing longitudinal 

 sulcus at right angles, the junction being broadened, and ending each side in an 

 ovate pubescent lateral fovea. Each elytron with a subepipleural carina and 

 subhumeral fovea on elytral flank, and four basal foveae. The first of these 

 foveae, the sutural, is the most apical and gives rise to the sutural stria; the 



