344 ANNALS NEW YORK ACADEMY OF SCIENCES 



Arizona: Phoenix, cotypes (Th. Pergande) ; Phoenix and Prescott, 

 running on trunks of cotton- wood trees (Wheeler). 



This species, as Emer}^ has remarked, is very similar to C. falJax dis- 

 color. It is even more like fallax rasilis, but the head and thorax are 

 more robust, the head is more excised behind, the clypeal notch smaller, 

 the epinotum more angular and the sculpture is different, the punc- 

 tures on the sides and front of the head being much smaller and the 

 surface of the head and thorax somewhat more shining. These differ- 

 ences, however, are not very pronounced and it may be necessary, when 

 sayi is better known, to reduce it to the rank of a subspecies of fallax. 



46. C. texanus Wheeler 



As I have published a detailed description of all four phases of this 

 handsome species (Psyche, 1903, p. 108), it may be passed over here 

 with a few remarks. It is readily distinguished from all the other mem- 

 bers of the fallax group by its large size (worker major 10-13 mm.), 

 and coloration, the worker major having a black head and gaster, red 

 thorax and legs, a yellow base to the first gastric segment and dark red 

 antennge. The male differs from all the known males of the fallax group 

 in the color of the thorax and legs, which are reddish yellow, with the 

 scutellum, metanotum and three spots on the mesonotum black and the 

 epinotum more or less infuscated. 



The types are from Travis County, Texas, and were found nesting in 

 oak logs. 



47. C. schaefferi Wheeler 



The female and worker phases of this species have been described in 

 detail in Journ. I^. Y. Ent. Soc, XVII, p. 88, 1909. The worker major 

 is as large as that of texanus and measures 9-12 mm., but it is yellowish 

 red throughout with darker mandibles, scapes and anterior border of the 

 head. The mandibles are distinctly flattened distally, and the anterior 

 border of the clypeus is flat and has a broader, shallower notch than in 

 sayi and texanus, with a small tooth on each side. In these characters 

 and in the sculpture of the head, there is an unmistakable resemblance to 

 the smoother forms of lierculeanus, such as ligniperda. The middle and 

 hind tibiae have two rows of stiff, graduated bristles on the distal half of 

 their flexor surface. In texanus, these bristles are smaller and less 

 numerous and seem to be rather inconstant; in sayi, they are lacking. 

 In the worker minor and female of schaefferi, which are colored like the 

 worker major, the median excision of the clypeal border is still shallower 

 and even more like that of lierculeanus and Icevigatus. The wings of the 



