256 NEOTROPICAL PSELAPHIDAE 



4. Intermediate femur with ventral face lacking spines, serrations or 



angulate extensions 5 



Intermediate femur not as described 6 



5. Intermediate femur with a minute pubescent patch near base of ventral 



face; intermediate tibia with a very small tooth near middle of 



ventral face ; 2 mm centralis 



Intermediate femur lacking pubescent patch ; intermediate tibia with 

 a very small tooth near apex ; 2.5 mm reitteri 



6. Intermediate femur very strongly arcuate, with the ventral face exca- 



vated, very thick near trochanter where ventral face is extended 



in a pronounced acute, aciculate angle; 1.8 mm cruralis 



Intermediate femur not as described 7 



7. Intermediate femur with a serrate line of small teeth or spines on 



base of ventral face ; 2 mm fuscocapillus 



Intermediate femur with very long spine before the middle of ventral 

 face ; 1 .2 mm hetschkoi 



Of the eight species assigned to this group in the neotropics, the female of 

 but one (centralis) has been described. Second, of these eight species only one 

 is known north of Panama [centralis from Guatemala). The following species, 

 based on four females, is very distinct from the female centralis and has been 

 found with ants. This is the first myrmecocolous record of the genus, although 

 it was previously suggested (Park, 1933) that at least some species of the genus 

 might be myrmecophilous. The description of this new species follows: 



Euphalepsus myrmecocolus new species 



Type Female. Measurements: Head 0.30 x 0.40 mm.; pronotum 0.43 x 0.43 

 mm.; elytra 0.80 x 0.87 mm.; abdomen 0.47 x 0.80 mm.; total length 2.0 mm.; 

 greatest width 0.87 mm. (PL XVIII). 



Body, femora, and first eight antennomeres dark red; tarsi, both ends of 

 tibiae and palpi tan; antennal club coal black. The pubescence dark brown, 

 abundant, recurved to subappressed. Integument moderately shining and lightly 

 punctate. 



Head with rounded tempora not quite as long as eyes but distinctly longer 

 than wide; eyes very large and prominent, composed of about 80 small facets, 

 ovate in lateral view, placed obliquely on sides nearer to ventral than dorsal 

 surface. Head in dorsal outline regularly trapezoidal, converging simply to 

 antennal tubercle at each antero-lateral angle ; vertex simple, rather flattened, 

 with a pair of large, deep, nude vertexal foveae. Front and clypeus simply 

 declivous between antennal tubercles. Labrum simple. Ventral surface of head 

 with a conical tubercle each side, between eye and cardo of maxilla, this 

 tubercle surmounted by a very long, thick, translucent spiniform process. 

 Genal-gular area bearing about 16 long, bristling, strongly capitate setae, 

 reminiscent of certain euplectine genera. 



