BEETLES OF THE GENUS MYOCHROUS — BLAKE 35 



first abdominal segment coarsely and rather densely punctate. An- 

 terior tibiae with the usual tooth and hind femora bluntly toothed. 

 Length 5 to 6.2 mm. ; width 2.4 to 2.8 mm. 



Type arul paratypes. — Type male and three paratypes, collected by 

 A. H. Jennings in April 1911, U.S.N.M. No. 59013 ; one paratype in 

 Museum of Comparative Zoology. 



Type locality. — Gatun, Canal Zone, Panama. 



Other localities. — ^IVIiraflores, Canal Zone, December 28, 1925, col- 

 lected by White and Clayton; Old Panama, January 1911, A. Busck. 



Remarks. — This is not a very distinctive species and can best be 

 recognized by the genitalia. Superficially the beetles are much like 

 M. platylonchus with which they commonly occur in the Canal Zone. 

 The shape of the aedeagus, however, is very different, resembling that 

 of M. femoralis Jacoby but smaller. The thoracic punctation is not 

 so dense or regular as in that species and the beetles are a little smaller, 

 but the two species are closely related. 



MYOCHROUS BARBADENSIS Blake 



Plate 3, Figueb 7 

 Myochrous barbadensis Blake, Proc. Ent. Soc. Washington, vol. 49, p. 27, 1947. 



From 5 to 6.5 mm. in length, elongate oblong, deep reddish brown 

 to piceous black, shining with a bronzy luster beneath the yellowish, 

 not closely appressed scales; thorax 3-toothed, coarsely but not very 

 densely punctate; elytral scales not so dense as entirely to conceal 

 punctation beneath. Tip of aedeagus with an unusually broad point. 



Head covered by yellowish scales down to antennal sockets, lower 

 front with finer, sparser, white hairlike scales ; a median depressed line 

 down occiput and dense deep punctures over upper head making the 

 surface rugose ; the usual occipital ridges on each side. Antennae red- 

 dish or yellowish brown, of the usual proportions. Prothorax a little 

 wider than long, with three well-developed lateral teeth and the usual 

 one at apical and basal angle, moderately convex, with a depression 

 along the basal margin most pronounced over the scutellum ; surface 

 coarsely and deeply but not densely punctate, with the scars of scales 

 forming shallow punctures between. Elytra not so densely scaly as 

 to hide the luster and punctation beneath ; punctures very coarse and 

 closely placed, with a tendency to transverse ridging in depression 

 below the basal callosities. Body beneath very shining, with sparse, 

 short, white hairlike scales, first abdominal segment not very coarsely 

 or densely punctate. Tip of last segment of male with a triangular, 

 of female with a rounded, pit. Hind femora bluntly toothed, an- 

 terior tibiae with the usual imier tooth. Length 5 to 6.5 mm. ; width 

 2.3 to 2.8 mm. 



Type and paratype. — Type male and one paratype female, U.S.N.M. 

 No. 67998, collected March 14, 1936, by K. E. Blackwelder. 



