JUBININI 43 



coming more well-defined apically with the apical margin elevated obliquely 

 on each side of depression. 



Prosternum medianly, longitudinally carinate for a short distance between 

 the anterior coxae, this longitudinal carina bifurcating obliquely to form an 

 arcuate, carinated edge as the anterior limit of each coxal cavity. Prosternum 

 not medianly, longitudinally carinate in anterior half. Mesosternum with a 

 longitudinal carina extending anteriorly from each middle coxal cavity to the 

 prepectoid area, the enclosed space between these mesosternal carinae being 

 very pubescent and concave. This concavity, however, is so obscured by 

 pubescence that it can be discerned only after careful manipulation. In the 

 center of the concavity is an elongate, rounded elevation. Middle coxae sub- 

 contiguous. Metasternum weakly concave medianly, with a median, longitudinal 

 carina. This carina is conspicuous because of its dark color, and extends from 

 between and posterior of middle coxae to the end of the medianly produced 

 posterior margin of the metasternum between the slightly separated posterior 

 coxae. Just ventral of the anterior end of the metastemal carina, the metaster- 

 num is produced into a thin tooth between the middle coxae. 



Legs simple. Anterior and middle coxae strongly conical; posterior coxae 

 much shorter. Femora slightly inflated. Tibiae slightly arcuate and slightly 

 inflated. Tarsi very long and very slender, cylindrical, of even diameter 

 throughout. First tarsomere very minute; second very long; third long, about 

 two-thirds the length of second, and bearing two short arcuate slightly un- 

 equal claws. 



Described from three male cotypes. Two taken at light at night on July 

 14, 1936; one at light at night on July 17, 1936. All collected by author on 

 Barro Colorado Island, Gatun Lake, Panama Canal Zone. 



This species is more closely allied to Sebaga centralis than to any other 

 species of the genus so far known. From centralis it may be readily separated: 

 centralis has the pronotal antebasal platform perfectly circular in outline; 

 the apical half of the pronotum has the posterior lateral corners extended 

 basally and then abruptly apically to form a broad tooth-like extension; last 

 stemite with a simple, shallow fovea; length 1.0 millimeter; rafjrayi has the 

 pronotal antebasal platform transversely ovate; the apical half of the pro- 

 notum has the posterior lateral comers evenly produced and not extended 

 posteriorly; last sternite of male with depression as described above; length 

 1.95 millimeters. 



Until more information accumulates upon tergite proportions in Sebaga, 

 Jubus, and allied aggregates, the relative lengths of the first and second tergites 

 should be dropped from generic keys. Sebaga centralis Raffray, Sebaga 

 scydmaenilla (Sharp), and the new species of this genus described in this 

 report have the first tergite longer than second. Raffray (1890, p. 300 and 

 fig. 3, Plate 6) shows centralis to have this condition. Raffray (1908, p. 26) 

 says that Sebaga has the first tergite not much larger than the second, and 

 Jubus has tergite one much larger than tergite two. The confusion is increased 

 by Raffray (1908, fig. 1, Plate 3) in which Jubus tetratomus Reitter is shown 



