592 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



longitudinal depression laterally (fig. 77); posterior lobe irregularly 

 punctured on anterior half. 



Scutellum: Longer than wide, 2.21:1.50; surface shining, rather 

 convex, with numerous, irregularly spaced punctiu-es becoming finer 

 apically. 



Hemelytron: Corium and clavus polished; exocorium punctate for 

 full length; mesocorium with two complete rows of punctures on 

 apical third; clavus with one complete row and one incomplete row 

 of punctures; costa without setigerous punctures; membranal suture 

 virtually straight; membrane very slightly longer than basal width, 

 slightly surpassing apex of abdomen. 



Propleuron : Polished, punctured on both convexities and in depres- 

 sion; prosternal carinae convex, as high as labial II. 



Mesopleuron: Evaporatorium reaching side margin of segment; 

 lateral polished area punctate. 



Metapleuron: Lateral edge of evaporatorium straight; lateral area 

 impunctate. 



Sternites: Pohshed, punctate laterally; sutures finely crenulate. 



Legs : Moderately long. 



Terminalia: Margin of genital capsule flared, surface with numerous 

 punctures, gonostylus as illustrated (fig. 267). 



Length of body: 5.92. 



Type data. — Holotype male (Carv) from Manaus, Amazonas, 

 Brazil, "Parko, 7, 1941." 



Discussion. — The elongate form, long labium, and lack of sub- 

 marginal setigerous punctures on the head is suggestive of Uhler's 

 species "Lobonotus anthracinus ," but members of this new species are 

 easily separated therefrom by the generic character of the peritreme, 

 and also by the very long first labial segment which here exceeds the 

 bucculae by about one-third of its length. The broad, longitudinal 

 impression laterally on the anterior pronotal lobe appears to be 

 unique in the Cydnidae of the Western Hemisphere. This character, 

 however, is probably restricted to the male. 



Dallasiellus {Ecarinoceps) megalocephaliis, new species 



Plate figures 62, 175, 208 



Diagnosis.— The very large head (fig. 62), which is broader than 

 half the width of the pronotum, should separate this C3^dnid from all 

 others in the Western Hemisphere. 



Description. — Male: Oval. 



Head: Length about three-fifths width, 1.54(1.49-1.56) :2.52(2.37- 

 2.60) ;interocular width, 1.51(1.49-1.56); anterior outline semicircular, 

 sometimes flattened; clypeus as long as juga, strongly narrowed at 

 apex; surface concave, vertex with a broad, shallow, U-shaped carina 



