LANTHUS 119 
equal width, broad and confluent except for a slight divergence at the lower end. 
Stripes 4 and 5 wanting. Legs blackish, yellowish at base. Wings hyaline with 
yellow costal margin and brownish stigma. Middorsal stripe of abdomen wide 
and trilobed on 2, narrow and continuous on 3 to 7, abbreviated triangular on 
8 and 9, and rounded on 10. Side margins of the moderately expanded segments 
7, 8 and 9 largely yellow with a blackish external border. Appendages blackish. 
Inhabits still water: a common species about the shores of the finger 
lakes in central New York; found by Professor G. W. Herrick trans- 
forming abundantly on the shore of Canandaigua Lake in June 1897. 
Taken in transformation by Mrs. P. Babiy on the shore of Keuka 
Lake at Penn Yan, N. Y. July 12th 1925. 
12. Lantuus Needham 
These are dainty little Gomphines conspicuously striped with black 
and yellow. In the venation of the wings there are several distinguish- 
ing characters. The stigma is short, hardly more than twice as long as 
wide. The upper section of the arculus (undivided portion of vein M) 
is short; vein M,_3 departing from it in a descending rather than in an 
ascending curve. There are usually but weak antenodal cross veins in 
the costal space between the thickened antenodals. The triangle of the 
hind wing is larger than that of the fore wing and tends to be angulated 
externally at the point where a weak trigonal supplement originates. 
The cell between the bases of A, and A; is often very long. The genital 
hamules of the male are inclined to rearward. The genus includes only 
two species of the eastern United States. 
The nymphs of this genus are stocky little fellows with short abruptly 
pointed depressed abdomen and with the flat broadly oval, third anten- 
nal segment overspreading the face. The labium is short, the sides of 
the mentum are parallel; the front border of its median lobe is straight 
and scale-fringed with some low chitinous teeth in the middle. The 
lateral lobe is obliquely rounded to the first of a series of coarse teeth 
on its inner margin, and there is thus, no distinct end hook. The second 
of this series of 6 or 7 teeth is largest and the others diminish in size 
proximally. There are very short lateral spines on abdominal segments 
8 and 9, and there are no dorsal hooks at all. 
These nymphs inhabit the sandy places in the beds of rocky spring- 
fed brooks where they burrow shallowly, and whence they are easily 
obtained by sifting. They do not at once make themselves evident by 
action, however; instead they feign death for some minutes after being 
taken from the water and are apt to be thrown away with the trash, 
undiscovered by the careless collector. 
