BEETLES OF THE GENUS MYOCHROUS — BLAKE 45 



more or less distinct teeth ; all femora strongly toothed ; no tooth on 

 inside of anterior tibiae. 



Head covered by coarse yellow scales down to antennal sockets, 

 surface below densely punctate, a small elevation where tubercles 

 usually are; the usual ridge on each side of occiput. Antennae red- 

 dish brown, of the usual proportions. Prothorax as long as wide, 

 strongly convex, an enlargement over the occiput consisting of an 

 elevation with a deep median depression, this depression extending to 

 a less marked degree down the middle of the thorax; surface beneath 

 the coarse yellow scales with coarse, rugose, and often confluent punc- 

 tures ; sides with a prominent tooth anteriorly and a less prominent one 

 in the middle and a trace of a third tooth on one side, also the usual 

 apical and basal tooth. Elytra much wider than thorax, convex, with 

 prominent humeri and a strongly marked basal callosity on each side 

 of the scutellum ; lateral margin distinctly serrate ; surface with coarse, 

 contingent, and somewhat irregularly shaped punctures, having trans- 

 verse ridgings or wrinklings ; scales at apex and sides forming a yel- 

 low band. Body beneath covered with coarse pale scales, all the 

 femora distinctly toothed; anterior tibiae without the usual inner 

 tooth. Length 6.5 mm. ; width 3.2 mm. 



Type. — I have examined the type, which is in the British Museum 

 of Natural History. 



Type locality. — Bahia, Brazil. 



Remarks. — The unusual development on the anterior part of the 

 prothorax distinguishes this from all other species. Otherwise the 

 thorax resembles that of the two following species, which have only 

 a slightly thickened anterior margin to the thorax. These three 

 species are closely related and present striking differences from the 

 rest of the genus in their strongly convex, narrow thorax with an 

 anterior enlargement, as well as the more developed elytral callosities 

 at the base, and the pale band at the apex. Two of the three have all 

 the femora toothed. 



The specimen sent me by the British Museum bears Jacoby's own 

 label and contrary to both his and Lefevre's description has two quite 

 distinct teeth on the sides of the thorax and a trace of a third tooth 

 on one side. 



MYOCHROUS CRASSIMARGINATUS, new species 



Plate 5, Figure 2 



From 6 to Y mm. in length, dark piceous, sometimes with a faint 

 greenish luster beneath the wide, closely appressed brown and white 

 scales, thorax as long as broad with a thickened anterior margin over 

 the occiput, with three lateral teeth (two of these usually incon- 

 spicuous) ; a distinct basal callosity on each elytron; punctation 

 unusually fine; anterior tibiae and hind femora toothed. 



Head covered by brown and white scales down to antennal sockets. 



