BEETLES OF THE GENUS MYOCHROUS — BLAKE 41 



Type locality. — Cocliabamba, Bolivia. 



Other localities. — Bolivia: Rurrenabaque, Beni Eiver (W. M. 

 Mann, Mulford Biological Expedition, 1921-22) ; Paraguay : San 

 Salvador (Dr. Bolils). 



Remarks. — The sparser elytral punctation beneath the mottled 

 brown and white scales distinguishes this from the two preceding spe- 

 cies. The aedeagus also has a differently shaped broader tip. These 

 three little species present a very similar appearance and are un- 

 doubtedly closely related. The most northern one has been collected 

 from Mexico to Colombia, the second one ranges from the Guianas 

 down to the Amazon, and the third has been taken in Bolivia and 

 Paraguay. Their chief differences are in punctation and the shape 

 of the aedeagus. 



MYOCHROUS RHABDOTUS, new species 



Plate 4, Figure 2 



About 6.5 to 7 mm. in length, elongate oblong, shining bronzy black 

 beneath the wide, pale brown scales, prothorax not very convex, 

 sparsely punctate, with three well-developed lateral teeth, elytra with 

 faint vittate markings either as the result of slight costae beneath or 

 faintly deeper brown scale coloration. 



Head covered with scales down to antennal sockets, the usual ridges 

 on each side of occiput and a median line half down the front ; pvmc- 

 tation moderately dense and coarse, not rugose. Antennae of the 

 usual proportions, deep reddish brown. Prothorax almost as long 

 as Avide, not very convex, depressed along the base, lateral sides with, 

 three large teeth as well as an apical and basal tooth ; punctation fine 

 and not dense in anterior portion, becoming denser and coarser toward 

 base ; scales about as broad as long, closely appressed, pale brownish. 

 Elytra without distinct basal callosity, punctures coarse but well 

 spaced, even in basal half, and becoming finer and more distant toward 

 apex; three faint longitudinal costae and the scales covering them 

 appearing slightly deeper brown, giving the elytra a faintly vittate 

 appearance. Body beneath shining with bronzy luster, much less 

 covered by scales, the scales finer and more hairlike. Hind femora 

 bluntly toothed, anterior tibiae with the usual inner tooth. Length 

 6.5 to 6.9 mm. ; width 2.6 to 3 mm. 



Type and paratypes. — Type male and two paratypes, Museum of 

 Comparative Zoology type No. 28122, collected by P. J. Darlington in 

 April 1929 ; one paratype, U.S.N.M. No. 59018. 



Type locality. — St. Augustine, Trinidad, 



Other localities. — Brazil: Santa Catharina (Bowditch collection) ; 

 Trintoad: "Trinidad," on sugarcane; D'Abadie; Golconda estate, 

 San Fernando; Aripo savanna, all collected in October 1918 by H. 

 Morrison. 



