166 
THIRTEENTH REPORT. 
Genus Gryllus Linnaeus. 
“All members of the genus Gryllus have the head and globos; the 
eyes large and rounded; the antennae thread-like and longer than the 
body; the pronotum broader than long, and about the width of the 
head; the hind femora of medium length but much enlarged and well- 
fitted for leaping; the hind tibiae with two rows of strong fixed spines, 
those nearest the apex being the longer; and the hind tarsus with its 
first joint sulcate above, with a row of minute teeth along each carina. 
The ovipositor is, in all the species, as long as or longer than the hind 
femora, and in the same species varies little in length. Most of our 
species are, however, dimorphic as regards wing length. . . . The 
inner wings vary much more than the outer, and sometimes are wholly 
lacking.” — Blatchley. 
29. Gryllus arenaceous Blatchley. — Body slender. Head black, about 
the width of pronotum, vertex swollen above pronotum; lower part of 
face reddish brown. Pronotum black; length about .7 of width; mar- 
gins truncate, median impression on anterior half, a series of small 
impressions on each side. Tegmina red-brown, lighter at humeral angle, 
overlapping, wings shorter than tegmina. Legs reddish brown or black. 
Ovipositor reddish brown. 
Measurements: — Length of body, 15 nun.; pronotum, 3.5 mm.; tegmina, 
9 mm.; hind femora, 10 mm. ; ovipositor, 16.5 mm.; width of pronotum, 
5 mm. 
30. Gryllus pennsylvannicus Burmeister. — Body stout and broad. 
Head a little wider than pronotum, vertex not swollen above pronotum; 
length of pronotum 7-12 its width, margins truncate, median impres- 
sion at both anterior and posterior margins, but not meeting in the 
middle. Tegmina overlapping, reaching to tip of abdomen; wings often 
longer than tegmina, projecting behind like a tail. 
Color: — Black excepting red-brown on the base of the hind femora, 
and golden brown tinge on the tegmina, which also have a yellowish 
stripe along the humeral angle. When first moulted, the insect is cov- 
ered with a gray pubescence, which later wears off. A freshly moulted 
adult was found August 10. 
Measurements: — Length of body, 17 mm.; pronotum, 3.5 mm.; tegmina, 
10.5 mm. ; ovipositor, 13.5 mm. 
GLOSSARY. 
Arolium. — The small pad between the claws at the end of the tarsus. 
Calcaria. — Claws or spurs at the end of the tarsus. 
Carina. — A narrow ridge or keel. 
Cerci. — The longer and more prominent pair of male abdominal ap- 
pendages. 
Clypeus. — A rectangular plate in the lower part of the face, to which 
the labrum is attached. 
Costa. — A broad longitudinal ridge. The ridge along the middle of 
the face. 
Coxa. — The basal joint of the leg, between the body and the femur. 
Cristate. — Crested. 
Elytra. — Wing covers. 
