AQUATIC INSECTS IN NEW YORK STATE 393 
boscis with round labellae, and only one half as long as the 
incurved, four jointed palpi; antennae 15 jointed, the basal joint 
disklike, the following joints each thickened at the base, in the 
male plumose, the last two joints elongated and slender; the 
eyes crescent-shaped. Thorax highly arched, without suture; 
scutellum rather small; metathorax prominent. Abdomen long 
and slender, somewhat flattened, from the base to the middle 
gradually widening, and again becoming narrower toward the 
end; hypopygium prominent, the ovipositor projecting. Legs 
long and slender, the metatarsus longer than the following tar- 
sal joint; claws small and simple. The wing veing and the pos- 
terior margin thickly haired; venation as in the figures. 
List of the North American species 
albipesn. sp. See p. 398. Ithaca N. Y. 
appendiculata Herrick, Minn. Geol. Nat. Hist. Sur. 1884. p.10. 
Known only in the larval and pupal stage and may belong to some 
other genus. 
plumicornis Fabricius var. americana. (See subsequent pages for 
synonymy) 
Saranac Inn N. Y., Lake Forest Ill., White mountains, N. H. (Slosson), 
Minnesota (Herrick) 
punctipennis Say, Acad. Nat. Sci. Phila. Jour. 1828. 3:16, and 
Compl. Wr. 2:48. Wiedemann, 1:14. Pennsylvania and New Jersey. 
trivittata Loew, Berl. Ent. Zeit. 1862. p.186. (Centur. 2,1). Maine, 
California, Alaska. 
This is a synonym of punctipennis according to Giles in his 
work Gnats or Mosquitoes. 
The larvae of but three North American species are known. 
‘To assist in separating the species which may be found later, I 
have given in the table the characters of some of the European 
species also. 
1 Antennae shortish and with a spine outwardly; anterior part 
of the head is spiny; club-shaped bodies at the caudal end 
Pee A CLARY Sigs aivir sriiere siateasw, ¢0)s'eceses appendiculata Herrick 
SERVICING LOU ASTUTE to sis aia in spalaieies tieie s biee ews vale Ne we ws slp eau (2) 
2 Ventral comb of the last abdominal segment with a row of 
brushlike hairs; each consisting of five to seven bristles 
PEInOOOHIT SUCCICM LU iiis Volkcdvcnveewecer enn velcawns fusca Staeger 
Ventral comb consisting of a number of separate feathered 
REM EE MEN Te aida wig vu cratela Gis Oe a ein si 6oe Dis Waa es ecets ok se es alee a ak (3) 
3 The pair of leaflike appendages [pl.39, ¢c. fig.4] lying cephalad 
of the labrum (1), at least one half as wide as long; ventral 
