86 NEOTROPICAL PSELAPHIDAE 



I have had to modify Raffray's early key to the genus (1898) in order to 

 incorporate recently discovered species: 



Pronotum nearly as long as wide 2 



Pronotum transverse, at least one-fourth wider than long (PI. XVIII, 

 2) 3 



2. Median longitudinal pronotal sulcus obsolete on disc; lateral pronotal 



foveae not, or very slightly, incising lateral pronotal margins; 1.6 



mm. long gracilis 



Median longitudinal pronotal sulcus deep and entire ; lateral pronotal 

 foveae deeply incising lateral pronotal margins . . dybasi new species 



3. Longitudinal, median pronotal sulcus very obsolete on the disc, form- 



ing a deep anterior and a deep posterior sulciform fossa. . .militaris 



(1.1 mm.; "Amazones", Brazil; antennae short, thick, with 



fifth segment larger than either the fourth or sixth segments) 



Longitudinal, median pronotal sulcus deep and entire for the whole 



of its length (PI. XVIII, 2) 4 



4. Fifth antennal segment subequal in size to fourth and sixth segments 5 

 Fifth antennal segment one-half wider, and slightly longer than either 



fourth or sixth antennal segments ; third tergite with a very long and 

 prominent spine directed posteriorly from the median third of apical 

 margin falli new species 



5. Lateral pronotal margins incised or notched each side opposite the 



lateral pronotal fovea pubescens 



(1.2-1.3 mm.; "Amazones", Brazil) 

 Lateral pronotal margins not incised each side opposite the lateral 



pronotal fovea richteri 



(1.5 mm.; Argentina) 



Rhinoscepsis falli new species 



Measurements: Head 0.27 x 0.27; antennae 0.47 total length, first segment 

 0.08, second segment 0.04, third to ninth united 0.16, tenth segment 0.04 x 0.05, 

 eleventh segment 0.13 x 0.07; pronotum 0.23 x 0.3; elytra 0.36 x 0.45; abdomen 

 0.45 including spine x 0.43 through second tergite; first tergite 0.13, second 0.13, 

 third 0.12 to base of spine, spine on third tergite 0.1 ; fourth 0.03, fifth 0.1. Total 

 length 1.4 x 0.45 mm. (PI. XVIII). 



Dark yellowish-brown with paler legs and maxillary palpi; integument 

 moderately shining; pubescence very short (0.02 to 0.03 mm. long), sparse, pale. 



Head with rounded temporal angles; the tempora nearly straight, longer 

 than the eyes. Eyes small, composed of 24 small facets, set obliquely on the 

 sloping anterior half of the head. Sides converging arcuately to form the long 

 antennal rostrum; distal end of this rostrum spherically expanded, bearing 

 apically the subcontiguously articulated antennae. Occiput medianly, longi- 

 tudinally carinate from base to the spherically enlarged end of rostrum. Vertex 

 and front granulate, two vertexal foveae on a line passing through the posterior 



