HARPALUSLE 225 



than the prothorax, oblong, very obtuse at apex, the sinus very feeble 

 but evident; striae deep and sulciform, the intervals convex and with feeble 

 iridescent lustre, the discal puncture only very little behind the middle. 

 Length (9) 3.8-4.2 mm.; width 1.5-1.7 mm. Isthmus of Panama 

 (Colon). Three examples. 



The hind tarsi are somewhat as in Stenolophus, the first joint as 

 long as the next two combined. 



*G. isthmianus n. sp. Much smaller than bifossifrons and rather 

 more slender, pale rufo-testaceous throughout, each elytron very faintly 

 clouded with a darker tint except broadly toward all the sides and more 

 narrowly at the suture, polished throughout; head well developed, the 

 eyes rather large, prominent, the foveae oblique and deeply impressed; 

 antennae much shorter than in the preceding, with very much shorter 

 joints, extending only to the basal part of the elytra; prothorax shorter, 

 two-fifths wider than long, rounded at the sides anteriorly, very oblique 

 and straight posteriorly, becoming sinuate only at the angles, which are 

 scarcely more than right, sharp and slightly prominent; base distinctly 

 narrower than the transversely truncate apex; surface nearly as in the 

 preceding; elytra oblong, three-sevenths longer than wide, one-half wider 

 than the prothorax, very obtusely rounded at apex, without evident 

 sinus; striae deep, intervals strongly convex suturally, less so externally, 

 the discal punctures more posterior, at three-fifths; hind tarsi shorter, 

 very slender, about two-thirds as long as the tibiae, with the basal joint 

 fully as long as the next two combined, the claws slender, scarcely at all 

 enlarged at base. Length (cf) 2.5 mm.; width i.o mm. Isthmus of 

 Panama (Colon). A single specimen, taken by Mr. Beaumont and sent 

 with examples of the preceding species. 



The anterior tarsi of the male are only feebly swollen and joints 

 2-4 have beneath two rows of long and extremely slender, hair- 

 like squamules, nearly as in Amerinus, one at each side of each 

 segment, mingled with rather coarse setse, so that they are difficult 

 to observe; the claws are moderately diverging and slender but 

 are more or less swollen at base internally. The middle tarsi are 

 short but do not seem to be modified on their under surface and have 

 nearly normal claws. It is certain that some of the Central Ameri- 

 can species placed in Bradycellus by Bates, will have to be trans- 

 ferred to this genus, though I cannot identify any one of them with 

 either of the species here described. 



AGONIDUS n. gen. This is a genus doubtfully assumed to lie in 

 the vicinity of Acupalpus, being so different in facies that before the 

 discovery of the criterion afforded by the number of supra-orbital 

 setse, it would probably have been associated with Blechrus rather 

 than Acupalpus. The body is subparallel, with very large orbicular 



T. L. Casey, Mem. Col. V, Oct. 1914. 



