276 NEOTROPICAL PSELAPHIDAE 



with a brush of long setae, and then extends down each pronotal flank. Neither 

 median nor lateral foveae discernible. A unique feature is a short accessory 

 sulcus, each side near lateral margin, which arises from the basal margin and 

 extends obliquely mesiad to enter the transverse sulcus. 



Each elytron with an entire sutural stria ; no basal foveae but with a faint 

 intrahumeral impression ; flank with a longitudinal carina extending from apical 

 margin and continues as a strong feature to apical third of elytral length, grad- 

 ually fading out between apical third and apical half; basal half of flank per- 

 fectly simple. 



Metathoracic wings well developed. 



Five visible tergites in a length ratio of 2/1/1/1/1 with margins as follows: 

 first three each side with a subentire, subparallel external and internal carina, 

 these carinae well-formed, the external following the arc of the elytral carina. 

 Internal carina of first basally bifurcated. 



Six sternites in a length ratio of 1/1/.4/.3/.3/1.5. First visible from side to 

 side, and with a large circular, pubescent fovea between posterior coxae. Sixth 

 sternite with apical margin produced. Penis partially extruded in holotype. 



Metasternum with a median longitudinal sulcus. 



Intermediate coxae narrowly separated by an unusually long and narrow 

 mesosternal process. Posterior coxae moderately separated by a distance equal 

 to half the median metasternal length. Intermediate trochanters triangular, with 

 a spine at center of ventral face. Posterior tibiae entirely arcuate. Tarsi thick, 

 tarsomeres of usual length proportions, with a large tarsal claw. 



Allotype Female. Similar to holotype save that (1) the head is simple, the 

 lateral incisure narrow, oblique and pubescent; vertexal foveae simple con- 

 nected by a narrow, anteriorly arcuate sulcus which is bounded apically by the 

 arcuate, tumid interantennal line of the simple front; clypeus simply declivous; 

 (2) tergite ratio 3/1/1/1/1; (3) sternite ratio 1/1.2/.5/.3/.5/1.2; (4) inter- 

 mediate trochanters unarmed. 



Erected on three specimens (holotype, allotype, male paratype) from rotten 

 log mold at Miller 3, by the author on July 29, 1936, on Barro Colorado Island, 

 Gatun Lake, Panama Canal Zone. The allotype and paratype had recently 

 pupated. 



By the 1908 arrangement of Raffray, Phybytharsis is nearest Batrybraxis. 

 It differs from Batrybraxis in numerous ways, among which may be noted: 

 pronotum with accessory, oblique sulci between basal margin and transverse 

 sulcus, and lacking lateral foveae; elytral flank with longitudinal carina in 

 apical third; it is also related to Dalmonexus but is distinct in lacking basal 

 elytral foveae and on posterior coxal separation. 



The remaining four tychine genera are distantly related by the essential 

 tribal characters and have little in common save the perfectly simple elytra. 



DALMOPHYSIS (Raffray, 1896) 



This is a monotypic Mexican genus with no nearly allied relatives, as 

 demonstrated by the following combination of characters: (1) Vertexal foveae 



