GNATHOTRICHUS., 947 
The habits of the North-American @. materiarius (Fitch) have been described by Fitch 
[Fourth Report on the Noxious Insects of New York, pp. 40-42 (1858)] and Howard 
[U.S. Dept. of Agriculture, Division of Entomology, Bull. no. 7, new series, p. 30 
(1897)]. 
1. Gnathotrichus consentaneus, sp. n. (Tab. VII. fig. 26.) 
Elongatus, cylindricus, fusco-piceus, prothoracis apice et elytrorum basi dilutioribus, pedibus testaceis ; 
prothorace ad apicem elliptice rotundato, disco posterius subtiliter reticulato et sparsim punctato ; elytris 
tenuiter reticulatis, obsoletissime lineato-punctatis, ad apicem in latere utroque preter suturam in callum 
plus minusve tuberculatum elevatis, 
Long. 3°3-4'3 millim. 
Elongate, cylindric. Head black, the front flattened, closely strigose with radiating aciculate scratches and 
with afew scattered hairs; antenne brown-testaceous, the club fuscous, obovate, with curved sutures, 
their margins set with short stiff bristles (¢), the joints of the funiculus and the two basal joints of the 
club bearing each a long curved cilium (2). Prothorax longer than broad, widest at the basal fourth, 
obliquely narrowed towards the apex, and elliptically curved, hind angles obtuse, base truncate; disc 
piceous or fusco-piceous, with the apex more or less broadly luteo-testaceous, elevated before the middle 
into a small transverse shining ridge, its anterior half asperate and shortly pubescent, the posterior half 
delicately reticulate, with fine scattered punctures, absent over the middle line. Scutellum triangular, 
shining, black. Elytra as wide as the prothorax and a little more than one-half longer, truncate at base, 
shoulders rounded-rectangular, sides parallel to beyond the middle, slightly incurved posteriorly, apical 
margin and sutural angles rounded; surface cylindric, declivous and convex behind, fusco-piceous, lighter 
towards the base, glabrous except for a few scattered hairs at the apex, with rows of indistinct fine 
punctures, the basal half of the sutural row subimpressed, interstices flat, alutaceous; declivity elevated 
on each side into a short callus bearing two small acute tubercles, sometimes indistinct, the interspace 
shining and not impressed. Underside fuscous-black. Legs testaceous, 
Hab. Mexico, Omilteme in Guerrero (H. H. Smith), Teapa in Tabasco (Hoge) ; 
GuaTEMALA, San Gerdnimo, Cerro Zunil, Totonicapam, Quiché Mountains, Volcan de 
Agua (Champion). 
The examples received suggest that more than one species may be here represented, 
but no separation appears to be feasible. The form described is that from Totonicapam, 
represented by six specimens. In the three largest the two small pointed tubercles on 
each callus of the elytral declivity are distinct and there are faint traces of further 
tubercles ; in the three smallest these tubercles are scarcely to be traced and the calli 
are less marked. ‘These differences are not sexual. 
A specimen from Teapa has the posterior calli sharply elevated, but very indistinctly 
tuberculated. 
Single specimens from the Quiché Mountains and the Volcan de Agua are more 
brightly coloured, with the basal half of the elytra ochreous. In the former the 
prothorax is ochreo-testaceous, with the sides and a median longitudinal streak fuscous. 
In both the rows of punctures on the elytra are more distinct than in the specimens 
from Totonicapam, and the apical calli carry a serration of four small pointed tubercles. 
(Length 3°9 millim.) 
An example from Omilteme and two from Cerro Zunil are similar to the smaller 
