various Central American Coleoptera. 159 
of one of them, feebly excised; antennae 9-jointed, 1 greatly 
thickened, 3-6 minute and very closely articulated, 7-9 large, 7 tri- 
angular ; elytra very sparsely, finely punctate, the punctures becom- 
ing coarser, closer, and subseriately arranged towards the suture, 
the two submarginal striae deep, the subhumeral stria short, the 
humeral callus moderately prominent. Beneath sparsely, finely 
punctate; ventral sutures distinct. 
Length 14, breadth 1 mm. (@.) 
Hab. Antities, St. Vincent (H. H. Smith). 
Five examples. This insect, like P. contracta, is so like 
a small immaculate Scymnus that it might be passed over 
as such. Then, again, P. insularis so closely resembles 
P. contracta that at first sight it appears to be referable 
to the same species; but the much larger, more contiguous 
eyes, the finely punctured metasternum, and the non- 
connate ventral segments readily distinguish P. imsularis. 
Gorham presumably intended to write P. contracta ?, as 
the present species bears no resemblance to the much 
larger submetallic P. brevis. | 
Ptilinus. 
Ptilinus, Geoffroy, Hist. Ins. Paris, i, p. 64 (1762); Mulsant 
et Rey, Térédiles, p. 226 (1864); Gorham, Biol. Centr.- 
Am., Coleopt. iii, 2, p. 198 (1883); Fall, Trans. Am. 
Ent. Soc. xxxi, pp. 277, 278 (1905) ; Pic, Cat. Anobiidae, 
p- 41 (1912). 
Gorham has recorded a species of this genus from 
Guatemala. A second very different form, also from the 
same country, was subsequently detected in our collection, 
and a third, P. mexicanus, Pic, from Mexico, was added in 
1901. Six are now known from the United States. The 
two from Guatemala are described below. 
*Ptilinus sericeus, n.sp. (Plate IV, fig. 8, 3.) 
Ptilinus sp. ?, Gorh., loc. cit. 
3. Elongate, rather broad, cylindrical, opaque, obscure ferrugin- 
ous, the tibiae and the base of the femora infuscate; thickly clothed 
with fine, silky, brownish-cinereous pubescence, the thorax with a 
broad, sharply defined, anteriorly abbreviated, darker, velvety median 
vitta, and various curved, sinuous dark marks on either side of it, 
the elytral depressions also appearing darker, owing to the diverted 
arrangement of the vestiture. Head very broad, densely rugulose, 
