NANOSELLA.—THROSCIDIUM. 153 
NANOSELLA. 
Nanosella, Motschulsky, Bull. Mose. xli. part 2, pp. 172, 187 (1868) ; Matthews, Trans. Am. Ent. 
Soc. xi. p. 153 (1884). 
Body exceedingly minute, cylindrical, elongate linear, pubescent. Head large, sessile, and prominent; eyes 
placed far back, prominent. Thorax large, subquadrate, widest at the base, with the posterior angles 
rectangular. Scutellum moderate, triangular. Llytra entire, very long, and linear. Abdomen with 
the pygidium exposed. Antenne very short and robust, 11-jointed—1 and 2 very large ; 3-7 subquadrate, 
robust; 8 larger than 7, cyathiform ; 9-11 forming a biarticulate, rather solid, and very much incrassated 
club, of which the two basal joints are amalgamated, but very evident, and the apical joint very large, 
obtusely conical, and furnished with a whorl of short sete beyond the middle. (Parts of the mouth not 
dissected.) Prosternum very short; episterna rather large, triangular; epimera small, not enclosing the 
coxal cavities; coxal cavities contingent, semiexcised, open behind. Mesosternum short, elevated in the 
middle, and produced into an acute point between the coxe; episterna small, humeral; epimera very 
large, extending to the coxal cavities; coxal cavities oval, oblique. Metasternum large, quadrate, 
extending to the sides of the body, produced into a short acute point between the posterior coxe ; 
episterna concealed by the elytra, with their interior apical angles alone visible; epimera concealed by 
the elytra, with their extremities minutely visible beyond the metasternum. Venter composed of six 
segments, of which the basal and apical are much longer than either of the others, the apical segment 
simple. Legs short; tibiee moderately dilated; tarsi short, 3-jointed, the basal joint much larger than 
the second, the third very long and slender; posterior coxe large, and very broadly laminated. 
This genus differs widely from every other of the Trichopterygide in the shortness 
and peculiar form of its antenna, and in the cylindrical and linear shape of the whole 
body. Motschulsky’s diagnosis of the genus Nanosella, although, like all his other 
descriptions, far too brief, is very accurate and intelligible. The single known species 
inhabits the United States and Central America, 
1. Nanosella fungi. 
Nanosella fungi, Motsch. Bull. Mosc. xli. part 2, p. 187, t. 8. f. 3°; Matth. Trans. Am. Ent, Soc. 
xi. p. 154”. 
Linear, very long, subcylindric, testaceous, clothed with short yellow pubescence ; head large and prominent; 
eyes large, placed far back; thorax rather longer and wider than the head, widest at the base, moderately 
but closely tuberculate, the basal margin nearly straight, with the angles nearly rectangular; elytra very 
long and narrow, not broader, but more than twice longer than the head and thorax, rather faintly and 
closely tuberculate, the sides nearly parallel, the apex slightly rounded; legs and antenne short, pale 
S 
yellow. Length 2, lin. =0°25 millim. 
Hab. Nortu America, Georgia (Motschulsky }?).—Guatemata, San Juan in Vera 
Paz (Champion). 
Of this interesting species, the smallest known coleopteron, one example was found 
by Mr. Champion in Guatemala. 
THROSCIDIUM. 
Throscidium, Matthews, Trich. Illustr. p. 64 (1872) ; Trans. Am. Ent. Soc. xi. p. 154, t. 3 (1884). 
Body elongate oval, convex, pubescent. Head rather large, sessile, deflexed ; eyes moderate, prominent, 
Thorax large, with the posterior angles acute and produced. Scutellwm moderate, triangular. Hlytra 
entire, long, obtusely rounded at the apex. Abdomen with the pygidium exposed, sometimes acutely 
BIOL. CENTR.-AMER., Coleopt., Vol. II. Pt. 1, February 1888. X* 
