HTMENOPTERA— FORMICID.T:. 619 



long as the basal joint, and thickens very slightly toward the apex. The 

 thorax, preserved so as to show more of a dorsal than a lateral view, is com- 

 pact, oval, less than twice as long as broad, with no deep separation visible 

 between the meso- and metathorax, tapering a little posterioi'ly. Flic pe- 

 duncle, as preserved, is a minute circular joint, but from its discoloration 

 appears to have had a regular, rounded, posterior eminence. The abdomen 

 consists of five joints, is very short oval, very compact and regular, and of 

 about the size of the thorax, although rounder. The legs are long and 

 slender, the femora of equal size throughout, and all the pairs similar. There 

 is no sign of wings, and the specimen is ^irobably a neuter. 



Length of body, 7.5°"" ; of head, 1.4""" ; of thorax, 3.2™"' ; of abdomen, 

 2.9"""; breadth of head, 1.1'"'"; of thorax, 1.9'"™ ; of abdomen, 2.2'""' ; diam- 

 eter of peduncle, 0.55"'"; length of first joint of antennae, 1'""'; of rest of 

 antennae, 1.65™"' I 



Green River, Wyoming. One specimen, No. 14692 (Dr. F. V. Haydenj. 



CA]HPONOTUS Mayr. 



Camponotus vetus. 

 PI. 5, Figs. 1, 2. 



Camponniiis vetus Scudd., Bull. V. S. Geol. Geogr. .Siirv. Terr., Ill, 742 (1877). 



A single specimen, very fairly preserved, lying upon the side ; a rem- 

 nant of one wing is left, and a faint indication of the antennae, but the legs 

 are wanting. The head has a flat summit, the upper half of tlie sides roundly 

 ])rotuberant, the lower half rather broad, and tapering Ijut little ; the tliorax 

 is long and moderately slender, compacted into a single mass, with a low 

 arch, more than twice as long as high. The fir.st segment of the abdomen 

 increases rapidly in size posteriorly, and has a rounded knob above at its 

 hinder end ; the abdomen is long and slender, composed of five joints, the 

 second the largest, gradually tapering to the pointed tip. It seems to agree 

 better with Camponotus than with any otlier genus, but has a difi'erently 

 shaped head and first abdominal joint, and is smaller than the species of that 

 genus, so that it is only placed here provisionally until other and better 

 specimens are obtained. 



Length of body, 3.75"'"'; of thorax, 1.15"""; of abdomen, 2'"™. 



White River, near tiie Colorado-Utah boundary. One specimen (W. 

 Denton). 



