HETEROCERUS.—PARNIDZA, 119 
than is the case with the specimens from Mexico; but I cannot find any satisfactory 
evidence of specific distinction. 
5. Heterocerus spinifer. 
Parvus, sat latus, opacus, subtilissime pubescens, nigro-fuscus ; elytrorum signaturis mediocribus pedibusque 
testaceis, tibiis fuscis ; prothorace lato, fortiter transverso, ad angulos posteriores marginato; metasterno 
linea obliqua munito. 
3 1 qj 
Long. 12, lat. 4 lin. 
Hab. Guaremata, Paso Antonio 400 feet, Guatemala city (Champion). 
The thorax in this species has only an extremely delicate pubescence. ‘The elytra are 
obsoletely striate, very finely punctate, and with an extremely short and fine pubescence ; 
there is a basal pale mark on each side of the scutellum, one near the suture in front 
of the middle, and external to this a small spot to represent the humeral mark; there 
is a postmedian rather large spot, and at the outer and hinder angle of this another 
spot, not quite reaching a small mark at the margin ; and, also disconnected with this 
latter, there is a small anteapical spot. The metasternal line is distinct ; and the front 
tibiee are armed with slender spines. 
The species is described from two rather immature individuals from Paso Antonio ; 
a third specimen from the same locality is but little more than a line in length, and 
has the pale spots on the elytra rather larger; the unique individual from Guatemala 
city has the pubescence of the upper surface not quite so short and delicate. Whether 
these two specimens are varieties or distinct species is very doubtful to me. 
Fam. PARNIDA. 
Up to the present time nothing has been known about the Central-American forms 
of this family. Mr. Champion’s successful work, however, has informed us that the 
Parnide are as well represented in Central America as in any other part of the world; 
for he has collected about as many species and quite as great a variety of genera as 
exist either in Europe or in North America; and very little is known of the Parnide 
from other regions. It is probable that all the Parnide are aquatic or subaquatic in 
their habits. Not more than one hundred and fifty species of the family are existent 
in collections. 
Subfam. PARNINTI. 
DRYOPS. 
Dryops, Leach, Zool. Mise. iii. p. 88; Latr. Gen. Crust. et Ins. i. p. 56; Er. Ins. Deutsch. iii. 
p. 517. 
Pomatinus, Sturm, Ins. Deutsch. xxii. p. 62. 
Helichus, Er. Ins. Deutsch. ii. p. 510 (note) ; Horn, Tr. Am, Ent. Soc. 1870, p. 31. 
