162 
THIRTEENTH REPORT. 
Key to Genera cincl Species of Locustidae. 
I. 
II. 
Tegmina and wings absent ; pronotmn not covering tlie rest of the 
thorax, ovipositor nearly straight, - eyes nearly round. 
Genns CeiUkophilus. 
1. Hind femora of male 10 — 13 very small, unequal spines, 
on outer lower earina. 
22, maculatus. 
2. Hind femora of male having, on outer lower earina, 8-12 very 
unequal spines, some of which are conspicuous hooks. 
23, latens. 
Tegmina and wings present. 
1. Vertex rounded or deflexed; hind tibiae with apical spine on 
each side; tegmina of nearly equal breadth throughout; 
superanal plate of male with long downward curv- 
ing spine. 
Genus Scudderia. 
a. Notch of supra-anal spine of male acute; hind 
tibiae green. 
24, Pistillate. 
b. Notch of supra-anal spine of male round; hind 
tibiae red. 
25, furcata. 
2. Vertex produced slightly upward to form a tubercle ; no api- 
cal spine on hind tibiae; fore and middle femora without 
spines beneath ; ovipositor nearly or quite straight. 
Genus Xiplvidium. 
a. Ovipositor shorter than the slender body; wings 
and tegmina longer than abdomen. 
26, fasciatum. 
Genus GeuthopMlus Scudder. 
These “wood crickets” or “camel crickets” are wingless, with the back 
curved, and with the head carried downward between the front legs. 
The vertex curves downward, and there are no grooves or ridges on the 
head, so that, excepting for the bright eyes, the face is quite character- 
less. The antennae are very long, slender, and tapering. The ovipositor 
is nearly straight, with only the tip slightly turned up. 
The members of this genus live in caves, or spend the day under stones 
and rotten logs. Our two species were found under logs. 
22. GeuthopMlus maculatus (Say). — The fore femora are quite un- 
armed; the middle have two very small spines on the lower margin; 
and the hind ones have about twelve very small nearly equal spines on 
the lower outer margin in the male. 
Color: — General color sooty brown. On the thorax there is often a 
yellow median line, and on the abdomen there are numerous small yel- 
low spots, often arranged in transverse rows. Hind femora are light 
reddish brown or yellow, with very small darker cross bars arranged in 
rows. 
Measurements: — Length of body, 12 mm.; prothorax, 3.75 mm.; front 
femora, 5.5 mm.; hind femora, 12 mm.; antennae, 38 mm. 
