BEETLES OF THE GENUS MYOCHROUS — BLAKE 55 



coarser and denser toward the base, and interspersed with fine, shallow 

 punctation (scale scars) . Elytra not very convex, with small humeral 

 prominences and two poorly defined costae in the basal part of each 

 elytron, the striate punctation beneath the short, closely appressed 

 yellowish scales unusually fine, leaving as wide an interspace between 

 the punctures as the punctures themselves. Body beneath rather 

 densely covered with scales, those on the prosternum much wider than 

 elsewhere on the beetle, those on the abdomen and legs finer; first 

 abdominal joint not coarsely punctate. Posterior femora not dis- 

 tinctly toothed, anterior tibiae with a blunt, rather inconspicuous 

 tooth beneath the long hairs. Length 8 to 9.5 mm.; width 3.7 

 to 4.1 mm. 



Tyfe. — In British Museum of Natural History ; a cotype examined. 



Type locality. — Caracas, Venezuela. 



Other localities. — ^Venezuela: Orinoco River, Mapire, Bolivar 

 Province, Lake Laglaize : Colombia ; Bolivia. 



Remarks. — This is the largest as well as flattest species of Myochrous 

 yet to be found, and is distinguished by the flattened sides of the 

 prothorax with a margin usually only undulate, yet occasionally with 

 three well-developed teeth. 



MYOCHROUS SALLEI Baly 



Plate 7, Figuee 6 

 Myochrous sallei Baly, Trans. Ent. Soc. Loudon, ser. 3, pt. 4, p. 335, 1865. 



From 7 to 8 mm. in length, elongate, reddish brown, densely covered 

 by closely appressed, short, white scales; thorax projecting over head 

 and almost concealing it, fully as long as wide and strongly convex 

 in front, inconspicuously 3-toothed. 



Head covered by dense white scales down to antennal sockets, lower 

 front less scaly, a median depressed line down front, upper part of 

 head and occiput overhung by anterior part of thorax. Antennae 

 longer than usual, extending down below the humeri, but of the usual 

 proportions, bright reddish brown. Prothorax about as long wide, 

 strongly convex in anterior part where it projects forward, with a 

 thickened anterior margin almost concealing the occiput; depressed 

 along the basal margin, especially over the scutellum ; sides very little 

 curved, nearly straight, with three tiny teeth ; punctation dense, deep 

 and coarse, becoming even coarser toward base and making the sur- 

 face rugose with transverse ridging; some finer superficial punctures 

 (scale scars) . Elytra over twice as long as thorax, narrowly elongate, 

 with small humeri, a slight trace of basal callosity and slight depres- 

 sion about scutellum ; punctation coarse, contiguous, with transverse 

 ridging in basal half, punctures becoming finer and more spaced to- 

 ward the apex, scales dense, white, closely appressed and rather short 

 and wide. Body beneath covered by white scales nearly as densely 



