510 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



Genus XANIONOTUM Brues. 



The single representative of this genus is hystrix Brues, from nests 

 of Eciton opacithorax Emery, Austin, Texas, 

 Unrepresented in collection. 



Genus CHONOCEPHALUS Wandolleek. 



The previously described species of this genus are from the Far 

 East, C. dorsalis Wandolleek,* being from Bismark x\rchipelago 

 and C. similis - Brues, from Bombay, India, The male has ^nngs 

 which are strongly, but microscopically haiiy, but the female has the 

 \\dngs, hal teres, and ocelli absent, Brues in "Genera Insectorum" 

 places this genus before Sijneura Brues in his arrangement of genera, 

 but it is certainly a more degenerate form than that genus and also 

 several others which it precedes in his arrangement. I have no 

 doubt that the species herewith described belongs to this genus, 

 though it occurs so far from the localities already cited, 



CHONOCEPHALUS BUCCATA, new species. 

 Plate 40, fig. 5. 



Female.— ^rovmish. yellow; head produced in front beyond an- 

 tennas, rounded anteriorly, about one-third broader at broadest part 

 than long at longest part, yellowish anteriorly, darker toward 

 vertex, the frontal bristles and ocelli absent, a few scattered, weak 

 hairs present, two to three disthict bristles on anterior eye-margin 

 behind antennae, viewed laterally the frons projects almost as far 

 beyond antennte as diameter of tliird antennal joint, antenna? yellow, 

 arista long and distinctly pubescent, eyes small, barel}' larger than 

 third antennal joint, facets distinct, not much more than 20 in number, 

 palpi small, distinctly bristled; dorsum of thorax extremely narrow, 

 a mere band, distinctly concave anteriorly and posteriorly, about 

 one-fourth as long at center as at side, abdomen oval, rather broader 

 at beyond middle (egg-shaped), first segment the longest, fourth 

 elongate but slightly shorter than first, numerous scattered hairs on 

 all segments, only appreciably longer on posterior margins, and 

 laterally on last two segments; legs yellow, covered with short hairs, 

 spurs of mid and hind tibias very small and weak, hind metatarsi 

 strong and as long as next three joints together. 



Length, 0,50-0.75 rmn. 



Type.— C&t. No. 14902, U.S.N.M. 



Five females, April 20, 1906, Cacao, Trece Aguas, Alta Vera Paz, 

 Guatemala, (Schwarz and Barber), 



One specimen shows two rather weak bristles on frons above the 

 anterior eye margin, but I can not detect them in the other specimens. 



1 Zool. Jahrb., Abth, Syst., vol, 2, 1898, p, 428, » Ann. Mus. Nat. Hungary., vol, 3, 1905, p, 554. 



