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 tibiae.) 



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. 



Histofical Revieiv. Most of us have learned to know these bugs under 

 the name Galgulidx, though they have been given by turns the names 

 Mononychidse and Nerthridss. 



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 antennse con- 

 cealed beneath them; have the third segment very short and small, 

 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 pi. 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. 



