272 NEOTROPICAL PSELAPHIDAE 



than posterior coxae. No abnormal modifications; sixth the longest, and trans- 

 versely oval. In the type the large penis is partially extruded between apical 

 sternite and tergite. 



Prosternum simple, subglabrous, with a fovea apical of each coxa. Meso- 

 sternum rugose with a strong median longitudinal carina for apical half. Meta- 

 sternum coarsely punctate, slightly medianly sulcate. Posterior coxae separated 

 by a distance equal to about one-third the metasternal length. Legs simple and 

 unarmed except that the anterior femora are slightly inflated with a flattened 

 ventral face. Tarsi batrisine, thick; first segment short, triangular: second four 

 times as long as first; third (distal) half as long as second, with two distinct 

 claws, a large, acute primary claw and a much shorter, slender accessor^' claw. 



Erected on a single type male, collected by the author on Barro Colorado 

 Island, Gatun Lake, Panama Canal Zone, July 28, 1936, in log mold at Zetek 3. 



This is a difficult species to analyse. It has the general cylindrical outline 

 of Dalmophysis, from which it differs in many basic generic characters such as 

 abdominal margin, relative tergite length, et cetera. In general epicranis appears 

 like a heavily punctate batrisine, and the tarsal claw aids this illusion whereas 

 the elongate first sternite precludes such association. Taxonomically the species 

 is near Batrybraxis. It agrees with Batrybraxis in tergite and sternite lengths 

 and separation of posterior coxae, but cannot be placed in this genus as (1) it 

 lacks vertexal foveae, lateral pronotal foveae per se and has a vestigial sutural 

 stria, and (2) has an entire longitudinal carina on elytral flank. 



DALMONEXUS new genus 



This new genus is distinct from other Tychini on the following combination 

 of characters: (1) Head with vertex, front and clypeus highly modified in the 

 male, but the occiput and vertex strongly, medianly, longitudinally carinate in 

 both sexes; (2) Eleven-segmented, simple antennae widely separated on the 

 antero-lateral angles of the front; (3) Maxillary palpi simple, four-segmented, 

 elongate and moderate in size; (4) Pronotum wider than long, abruptly nar- 

 rowed in basal third; subbasal sulcus connecting a lateral fovea each side; (5) 

 Each elytron with entire sutural stria, but lacking basal foveae; flank with a 

 strong, longitudinal carina for apical half of length; (6) Six stemites in both 

 sexes; (7) Five visible tergites, the first three laterally margined each side; (8) 

 Posterior coxae widely separated by a distance equaling three-fourths the meta- 

 sternal length. 



Dalmonexus seeversi new species 



Holotype Male. L20 mm. long x 0.60 mm. wide. 



Moderately shining dark red when mature, palpi and legs paler. Flavous 

 pubescence moderately abundant, long and bristling on head, pronotum and 

 elytra; pubescence sparse and subappressed on abdomen. Integuments lightly 

 punctulate. 



Head distinctly wider through eyes than long; tempora very short, very 



