46 THE UNIVERSITY SCIENCE BULLETIN. 
rostrum is short, stout and four segmented. The fore legs are strongly 
raptorial. The limbs are more or less spinous. The fore and middle tarsi 
are one segmented, and the hind tarsi two segmented. (Under a lens 
Gelastocoris appears to have two segments in middle tarsus, one a very 
short one, and three in the hind tarsus, the basal one a short one. Cleared 
and mounted limbs show the long segments to be attached to the tibie.) 
Three genera are present in this country. Gelastocoris Kirk., Mononyx 
Lap. and Nerthra Say. The first enbraces three species, each of the lat- 
ter, one, a total of five species for America north of Mexico. 
Historical Review. Most of us have learned to know these bugs under 
the name Galgulidx, though they have been given by turns the names 
Mononychide and Nerthride. 
KEY TO GENERA. 
A. Fore wings free. 
B. Fore tarsus with two claws. Gelastocoris. 
(Galgulus) 
BB. Fore tarsus with a single claw. Mononyx. 
AA. Fore wings fused together on the back. Nerthra. 
Genus GELASTOCORIS Kirk. 
Variously marked, often mottled, exceedingly variable bugs of a broad 
flat appearance. The eyes are very protuberant and the antennz con- 
cealed beneath them; have the third segment very short and smail, 
and “completely connate with the fourth.” All the tarsi end in two 
strong claws. In ventral view the terminal abdominal segments of the 
male are seen to be asymmetrical. (See pl. IX.) In the female the 
6th ventral segment is more or less convex along the middle. In 1901 
Champion said that Montandon’s monograph of this genus would appear 
shortly. In 1905 Bueno wrote that the only way to determine the species 
was by comparing the notes given by Champion. The writer has not yet 
found Montandon’s monograph. The key to the three species is made 
from Champion’s notes. Bueno has said that he is aware of several 
undescribed species. 
KEY TO GELASTOCORIS 
A. Lateral angles of pronotum rounded, moderately dilated and finely 
crenate. Pronotum slightly constricted. G. oculatus. - 
AA. Lateral angles of pronotum acute. 
B. Lateral angles of the pronotum transverse or subtransverse 
along their anterior edge, distinctly crenate in front and be- 
hind. Spots on elytra well marked, often more or less ocel- 
lated. G. variegatus. 
BB. Lateral angles of the pronotum oblique in front and less 
coarsely crenate. General coloration more obscure than in 
species above. G. vicinus. 
