80 



FAMILY IV. — CYDNID.-E. 



our other species it is readily separated by the smooth, sub- 

 convex, shining cheeks, and from all but subpunctatus by the lack 

 of transverse impression on pronotum. 



IV. Geocnethus Horvath, 1919, 245. 



Differs from Geotomus mainly by the characters mentioned 

 in key and by having joint 4 of antennae distinctly longer 

 than either 2 or 3, which are subequal in length. The genus 

 is represented by a number of species in South America but 

 only one is so far known from this country. 



42 ( — ). Geocnethus cavicollis (Blatchley), 1924, 85. 



Broadly oval, subdepressed. Head, pronotum, scutellum and under 

 surface black, shining; hind margin of pronotum and corium piceous; 

 membrane dull whitish- to fuscous-hyaline; antennae, beak, tibia? and 

 tarsi reddish-brown; femora piceous. Head slightly wider across the 

 eyes than long, its front margin broadly rounded, thickened and reflexed, 

 but without bristles or teeth within the margin; cheeks vaguely, trans- 

 versely rugose, sparsely, irregularly, rather finely punctate, each with 

 three erect discal seta?. Antenna? with joint 2 more slender than 3 and 

 almost nude, 3 — 5 thickly pilose with stiff suberect hairs, 5 slightly longer 



than 4. Beak reaching middle coxa?. 

 Pronotum about 'twice as wide as its 

 median length, the front margin 

 broadly concave, bordered within by 

 a regular row of rather coarse punc- 

 tui-es, the lobes separated only by an 

 incomplete transverse row of coarse 

 punctures; side margins feebly sinu- 

 ate; disk of male with a large, broad, 

 rather deep impunctate concavity on 

 middle of apical half, on each side of 

 this sparsely and coarsely punctate, 

 the punctures extending along the 

 sides behind the concavity to basal 

 third; disk of female with a vague 

 wide transverse impression. Sub- 

 margins of head and pronotum with 

 a few scattered erect bristly hairs. 

 Scutellum with a submarginal row 

 of fine punctures and a few coars- 

 er scattered ones on apical half. Corium with four irregular rows 

 of punctures, the inner row nearly entire, the others abbreviated ; clavus 

 with a single row of punctures; membrane not reaching apex of abdo- 

 men in either sex. Genital plate of male deeply concave above, its apex 

 broadly rounded. Length, 5 — 6 mm. (Fig. 14). 



11. X 8 



&1 

 i Original I 



