246 PROCEEDINGS OF THE NATIONAL MUSEUM Vou. 113 
Smicronyx languidulus Dietz 
Smicronyz languidulus Dietz, Trans. Amer. Ent. Soc., vol. 21, p. 152, 1894. 
Lectotype, here designated: Male, Maryland, CM (Ulke collection). 
Description: Rostra of both sexes black, moderately curved, punc- 
tate and squamose behind antennal insertions; stouter, distinctly 
substriate and punctate from base to apex in male; smoother, not as 
distinctly substriate and punctate in female. Head black, finely 
alutaceous, front sparsely squamose. Prothorax black, broadly rounded 
at sides, slightly narrowed anteriorly; disk rather finely and 
remotely punctate, interspaces finely rugulose; impunctate median 
line present but abbreviated at the ends; prosternum shallowly 
emarginate, slightly concave, antecoxal ridges barely distinct. 
Elytra moderately convex above, humeri distinct, declivities barely 
distinguishable; intervals thinly covered with ochreous-yellow scales, 
each interval bearing two rows of ovate scales and one row of linear 
scales. Scutellum glabrous and shining at center. Femora rufous, 
moderately clavate, thinly covered with yellowish gray scales. Tibiae 
rufous, covered with widely separated rows of linear yellowish gray 
scales. Tarsi rufopiceous; third segment distinctly broader than 
first two, fourth segment projecting distinctly beyond third; claws 
connate for approximately half their length. 
MrasuREMENTs: The following measurements were taken from 
the male lectotype from Maryland (Ulke collection, CM), a male 
from “D.C.” (Ulke collection, CM), a male from Wapello, Co., Iowa 
(USNM), and a female from Priest Bridge, Maryland (USNM). All 
measurements are in millimeters: 
Males Female 
Mean Extremes 
Body length 1. 60 1. 45-1. 70 1.50 
Elytra length 1.05 0. 90-1. 15 1. 00 
Elytra width at base 0. 64 0. 55-0. 70 0. 60 
Prothorax length 0. 45 0. 45 
Prothorax width 0. 51 0. 48-0. 55 0. 50 
Rostrum length 0. 63 0. 60-0. 65 0. 60 
Rostrum length before antennal 0. 20 0. 25 
insertion 
Funicular segment 2 length 0.042 0. 034-0. 051 0. 034 
Funicular segment 3 length 0. 034 0. 034 
Biotocy: No biological information on this species is presently 
available, with exception of one specimen having been recorded ‘‘on 
cotton” in June at Concord, North Carolina, by H. F. Howden. 
Discussion: The combination of the relatively large, broadly 
rounded prothorax, and the small, widely spaced elliptical yellow 
scales of this species make it fairly easy to distinguish from the rest 
of the species of the S. instabilis group. 
