184 
REPORT ON ZOOLOGY, MDCCCXLll : 
perfect tarsal grooves; the known species are, A. dentzp€s, Esch., from 
California; and A. chrysomelina from the west of the Rocky Moun- 
tains in North America. 
Michrochcetes scoparius and Limnichus australis of the reporter, 
are two new species of this family from Van Diemen’s Land (Arch. 
1842, i. p. 153). 
Macrodactyli. — Parnus longipes, Redtenhacher (Col. Austr. p. 14, 
n. 12), from the brooks of Austria, is the same with P. substriatus, 
Miill., Dumerilii^ Latr. 
Blanchard has described two new species in D’Orbigny’s Voy. d. 
I’Amer. Mer., Parnus puhescens and Potamophilus cinereus, Bl., of the 
size of P. acuminatus, both from Corrientes. 
HETERocERTDiE. — Kicsenwctter has published an excellent work on 
Heterocerus (Germ. Zeitschr. iv. p. 194, t. 3). The species of this genus 
closely resemble each other, so that hitherto there have been no funda- 
mental distinctions ; but a minute examination has brought to light a 
surprisingly rich collection of them. The author describes twenty 
species examined by himself, and thirteen of these are certainly native 
to Germany. Among these, — H. parallelus, Gebl., and H. femoralis, in- 
habit salt districts ; H. fossor, marginatus, F., hispidulus (marginatus, 
Pz.), ohsoletus, Curt., Icevigatus, Panz., ohliteratus, fusculus, are pretty 
widely distributed ; H. intermedius, at Berlin and Stettin ; sericans, in 
Saxon Switzerland and Austria (also Italy) ; pulchellus at Leipsic ; 
murinus, found by Dr. Rosenhauer at Augsburg; H. minutus, Dej., is 
from the south of France ; H. Jlavidus from Italy (Scarab, jl. Rossi) ; 
li. euphraticus and minimus, have been collected in Mesopotamia ; H, 
limbatus, Kn., from North America ; H. varius and lituratus, from St. 
Thomas in the West Indies. The following species have only become 
known to the author by description : H. dubius, F., from the East Indies ; 
H. pallidus and pusillus, Say, from North America ; H. hamifer and 
nanus. Gene, from Sardinia ; in all twenty-five species, of which two- 
fifths are new. 
Hydrophilidas. — Robert (Ann. Sc. Nat. xviii. p. 378) has proved 
that Hydrophilus piceus, even in the state of a perfect beetle, does not 
feed on water plants but on water snails (Limnceus). 
A new German species, Hydrcena dentipes, Mark., discovered by 
Markel at Pirna, has been described and figured by Germar (Faun. Ins. 
Europ. xxii. 5). Hydrobius marginicollis and assimilis, Hope, from 
Port Essington (Proceed. Ent. Soc. p. 48) ; and Cercyon dorsale of the 
reporter, from Van Diemen’s Land (Arch. 1842, i. p. 153), are new New 
Holland species. 
The description of the Hydrophili, for D’Orbigny’s voyage, begun 
by Brulle, has been finished by Blanchard (vide Jahresb. f. 1838, p. 
314). The following are described in the new number: Hydrophilus 
228 
