BEETLES OF THE GENUS MYOCHROUS — BLAKE 47 



(scarcely 3-toothed) lateral margin, strongly convex; anterior and 

 posterior femora bluntly toothed, anterior tibiae with inner tooth. 



Head covered with broad scales to the antennal sockets, below this 

 the scales less dense and finer ; surface beneath densely but not rugosely 

 punctate, with a faint depressed median line and on each side of 

 occiput a distinct ridge. Antennae reddish brown, the joints of the 

 usual proportion (last four missing). Prothorax just about as long 

 as wide, strongly convex, with a thickened anterior margin having 

 on each side a narrow ridge running down a little way, and a slightly 

 depressed area between the ridges, and behind the margin ; sides more 

 angulate than 3-toothed, Avith the usual basal and apical toothing; 

 depressed along the basal margin ; surface beneath the scales shining, 

 densely and moderately coarsely but on the disk not rugosely punctate, 

 the punctures on the sides running together in long striations with 

 ridgings between. Elytra much wider than thorax, distinctly serrate 

 along the sides, a pronounced basal callosity on each side of scutellum, 

 and prominent humeri with a deep intrahumeral sulcus and a trans- 

 verse depression below ; punctation irregularly striate, the punctures 

 dense and not round but distorted by the transverse wrinklings in basal 

 half and on sides; scales broad, closely appressed, brown and white 

 with a broad white band at apex and also along the sides. Body 

 beneath not so densely squamulose, the scales not so wide, but closely 

 appressed, first abdominal segment not coarsely punctate. Anterior 

 and hind femora bluntly toothed ; anterior tibiae with a strong inner 

 tooth. Length 7.6 mm. ; width 4 mm. 



Type. — In Bowditch collection. Museum of Comparative Zoology 

 type No. 28119. 



Type locality. — Cayenne, "e coll. Chevt." 



Remarks. — This is the largest of the three species in the curculion- 

 oides group, and unlike curculionoides it has a modified thickening of 

 the anterior margin of the prothorax similar to that of crassimargina- 

 tus.) and likewise has a tooth on the inner side of the anterior tibiae. 

 The very wrinkled appearance of the elytra is unlike that of either of 

 the other species. The punctures are not rounded but more stellate 

 and irregular. As in the other two species, there are gibbosities at the 

 base of the elytra and the scales at the apex are pale. Like them, too, 

 the thorax is much narrower than the elytra. 



MYOCHROUS ARMATUS Baly 



Plate 6, Figure 5 



Myochrous denticollis Boheman (nee Say), Eugenics Resa, Insects, p, 161, 1858. 

 Myochrous armatus Baly, Trans. Ent. Soc. London, ser. 3, voL 2, p. 336, 1865. 

 Myochrous hohemani Lefi^vee, Ann. Soc. Ent. France, ser. 6, voL 4, Bull., p. Ixxvi, 



1889. 



From 6 to 7 mm. in length, broadly oblong, the thorax about half as 

 long as the elytra, shining black with a slight bronzy luster beneath 



