12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



elytra in transverse depression below basal callosity and along suture 

 at base. 



Head with interocular space more than half width of head, occiput 

 polished, rounded, impunctate, groove from eye to frontal tubercles 

 with punctures along it, carina short and distinct, head entirely dark. 

 Antennae extending below humeri, entirely dark, basal joints with 

 metallic blue sheen, third joint about same length as fourth, remainder 

 subequal and hairy. Prothorax slightly wider than long, with arcuate 

 sides and oblique anterior angles, moderately convex, without de- 

 pressions, polished, impunctate, entirely dark. Scutellum dark. 

 Elytra moderately convex, below basal callosity a transverse depres- 

 sion in which are remnants of striate punctation, rest of surface with 

 very fine confused punctation visible only under high magnification; 

 surface polished, dark blue. Body beneath and legs shining, entirely 

 dark blue. Length 2.3-2.9 mm.; width 1.3-1.5 mm. 



Type, male, USNM 66195, and 13 para types, from Ponce and 

 Aibonito, Puerto Rico, collected on Croton species by R. G. Oakley, 

 September 7, 1933, August 1933, and July 10, 1934. 



Remarks. — It is interesting to note that many species of Aphthona 

 occur on the Euphorbiaceae. 



Longitarsus cylindricus, new species 



Figure 2 



About 1.5 mm. in length, elongate oval, shining, very finely punc- 

 tate, elytra without wings or humeral prominences, widest at middle, 

 yellowish brown, sides of pronotum darker brown; antennae dark with 

 joints three, four, ten, and eleven pale; outer joints thicker and hairier. 



Head with interocular space approximately half width of head, 

 occiput polished, deeper brown than lower front, a group of punctures 

 near eye, frontal tubercles clearly marked, carina down lower front. 

 Antennae fully half length of body; third, fourth, tenth, and eleventh 

 joints pale; outer joints slightly longer and thicker, Prothorax con- 

 vex, somewhat wider than long, sides slightly arcuate with oblique 

 angles anteriorly and tooth at base, a long hair at each corner; very 

 finely punctate, surface polished, yellow brown with sides deeper 

 brown, Scutellum brownish. Elytra convex with rounded sides 

 and no humeral prominences, without wings, surface polished, more 

 distinctly punctate than prothorax, entirely yellowish brown. Body 

 beneath with breast and prosternum usually slightly deeper brown 

 than abdomen and legs, shining, anterior coxal cavities open, hind 

 femora enlarged, hind tibiae shallowly channelled with spur at end, 

 first tarsal joint very long. Length 1.2-1.6 mm.; width .6 mm. 



Type, male, USNM 66190, and three para types, collected on weeds 

 at Adjuntas, Puerto Rico, by R. G. Oakley, October 11, 1934. 



