JUBININI 53 



carinae, to a low point just back of the mentum. Sides of the head subearinate 

 anterior of the eyes, and evenly rounded posterior of the eyes. 



Pronotum wider than the head, with the transverse arcuate sulcus dividing 

 the pronotum into two unequal portions ; anterior portion is more than twice as 

 long as the posterior portion, and a third wider. This anterior part is subrhom- 

 boidal, with the sides converging to the semicircular apical border on each side 

 from a very small acute tooth, this tooth arising opposite the transverse sulcus 

 on each side. Posterior to this lateral tooth, the basal portion of the pronotum 

 is formed by the sides becoming abruptly narrower. Transverse sulcus curves 

 posteriorly on each side and ends just below the marginal tooth. 



Elytra with the base transversely carinate. Each elytron with three basal 

 foveae recessed beneath the transverse carina. Sutural fovea gives rise to an 

 entire sutural stria. There is no dorsal stria. The median and lateral foveae are 

 mutually closer than is the median to the sutural. The humeri are not dentate. 

 Flank of each elytron with a conspicuous longitudinal carina; this carina is 

 abruptly arcuate basally to recess the rather large subhumeral fovea. Each 

 elytron, then, with three basal foveae and a subhumeral fovea; an entire sutural 

 and epipleural stria but no dorsal stria. 



Abdomen with five visible tergites, narrowing to a subtruncate apex. First 

 and second tergites subequal in length; third tergite shorter than second; third 

 and fourth tergites subequal in length; fifth tergite rounded triangular, about 

 as long as fourth. Six visible sternites; first sternite broadly triangular between 

 posterior coxae; second sternite as long as first; third sternite long, as long as 

 second; fourth sternite one-half as long as third; fifth very short medianly, a 

 third as long as fourth, deeply, semicircularly incised to contain the sixth ster- 

 nite; sixth large, medianly twice as long as the fourth sternite, and the median 

 posterior margin deeply incised. The ventral surface of the abdomen is conspic- 

 uously, medianly concave; all of the sternites are involved, with their median 

 halves flattened or concave and differentiated from the sloping sides. This con- 

 cavity is notable on the second and third sternites, where the limits of the con- 

 cavity are subearinate. The sixth sternite has a secondary median concavity. 



Prostemum prominent anterior of the coxae, and medianly gibbous but 

 not carinate. Mesostemum laterally carinated. Metasternum very long, as long 

 as first and second sternites united, but not carinated medianly; it is medianly 

 concave. All coxae well-developed, the anterior coxae very prominently conical; 

 middle coxae apparently contiguous and elongate-ovoid; posterior coxae also 

 very prominent, conically produced mesially, and subcontiguous. The conical 

 portion of each posterior coxa is carinate on the mesial face, and the mesial- 

 posterior angle is produced in a sharp point. Trochanters not armed. Femora 

 slightly inflated, the anterior pair especially. Tarsi three-segmented, elongate, 

 cylindrical in the jubine pattern, first tarsomere minute; second and third much 

 longer, subequal in length, the third ending in two claws. 



Described from one specimen, a male. This type was collected by the author 

 on July 25, 1936, on Barro Colorado Island, Gatun Lake, Panama Canal Zone, 

 from moist stage four log mold at Drayton 12. 



