1907.] Wheeler, Funyus-growing Ants of North America. 727 



large, horizontal, half as long as the head and extending out laterally a little beyond 

 the borders of the head. Posteriorly each of the.se lobes has a deep subtriangular 

 depression in its surface. The ridges of the frontal carina' diverge Ixickward to the 

 posterior corners where they pass over into the postorbital carina^, not through a 

 rounded arc but rectangularly, so that the termination of the antennal groove is 

 broad and truncated. There is a ridge on each side of the inferior occipital portion of 

 the head and a pair of projections on the vertex, which are continued laterally along 

 the occipital border as a pair of blunt ridges to the posterior corners. Antennal 

 scapes enlarged towards the tips, which extend a little beyond the posterior corners; 

 joints 2-7 of the funiculus a little broader than long. Thorax robust; pronotum 

 with a pair of acute inferior teeth, which are directed forward, and a blunt protuber- 

 ance on each side above. Mesonotum in the form of an elevated, elliptical and 

 sHghtly concave disc, bordered with a low ridge which is interrupted in the middle 

 behind and in the middle on each side. This ridge bears a pair of rounded swellings 

 just in front of its lateral interruptions. Mesoepinotal constriction deep and narrow. 

 Epinotum with a pair of swellings at its base; declivity sloping, longer than the 

 base; spines reduced to a pair of laterally compres.sed and rather acute teeth which 

 are as long as they are broad at the base. Petiole and postpetiole resembling each 

 other in shape, the former twice as broad as long, broader behind where its sides are 

 produced as a pair of blunt angles; it is flattened above, without spines or teeth and 

 with a small semicircular impression in the middle of its posterior border. Post- 

 petiole J broader than the petiole, more than twice as broad as long, rounded in 

 front, with a median groove, broadening behind; posterior margin with three semi- 

 circular impressions of which the median is the largest. Gaster longer than broad, 

 suboblong, with straight, feebly marginate sides, rounded anterior and posterior 

 borders, and a short median groove at the base of the first segment. Hind femora 

 curved, with an angular, compressed projection near the base on the flexor side. 



Opaque throughout, -very finely and densely punctate-granular. 



Hairs minute, appressed, slightly dilated, glistening v.hite, rather sparse and 

 indistinct. Pubescence fine, whitish, confined to the antennal funiculi. 



Ferruginous yellow; clypeus, frontal lobes, front and middle of vertex more or 

 less brownish; mandibular teeth black. 



jNIexico: Santiago Ixtquintla, Tepic (Eisen and Vaslit). 



This species, which I have rcdescribed from a t^iJC specimen kindly 

 sent me by ]Mr. Pergande, at first sight closely resembles C. wheeleri. It 

 may be distinguished, however, by the absence of teeth on the petiole, the 

 much broader and more truncated ear-like corners of the head, longer 

 antennal scapes and much blunter ridges and projections on the thorax. 

 C. flavidus is thus intermediate in several respects between icheeleri and 

 rimosus, but is undoubtedly a di.stinct species. Although at present known 

 only from northern Mexico, it may be expected to occur as far north as the 

 southern portions of Arizona and California. 



