154 Zoologica: N. Y. Zoological Society [III; 4 



declivity, the spines of the worker represented by blunt angles 

 on the sides. Gaster elongate, with subparallel sides, the first 

 segment subrectangular, nearly as long as broad. 



Smooth and shining, the epinotum between the angles reti- 

 culate, the node of the postpetiole smooth. 



Hairs decidedly shorter than in the worker, more abundant 

 on the head and thorax than on the abdomen. 



Color much like that of the worker, but the thorax as dark 

 as the head and gaster, except the anterior portion of the 

 pronotum, the prescutellum and epinotum which are more 

 castaneous. 



Described from a female and several workers constituting a 

 single small colony found July 24 nesting in the petiole of a 

 young Tachigalia growing on the Cuyuni trail, near Kartabo. 



This form approaches C. sumichrasti Mayr in many particu- 

 lars but is, I believe, quite distinct, especially in the shape of 

 the head, mesonotum and petiole, in the pilosity of the legs, color, 

 etc. It also recalls forms like limata Smith, brasiliensis Mayr 

 and lutzi Forel. The antennal club might be regarded as indis- 

 tinctly three-jointed. The female is very small compared with 

 the corresponding phase of the limata group. Mayr's laevis is 

 also a closely allied form, but the petiole and median funicular 

 joints of this species are shorter, the pro- and epinotum smoother, 

 the color is paler, etc. I have three workers taken by Mr. F. M. 

 Gaige at Castries, St. Lucia, W. I., which agree very closely with 

 the types of delitescens. 



14. — Solenopsis altinodis Forel 

 (Fig. 15, a-c). 



Worker. Length 1.8-2.1 mm. 



Head about one and one-sixth times as long as broad, sub- 

 rectangular, as broad in front as behind, with straight posterior 

 and very feebly convex sides. Eyes consisting of about a dozen 

 ommatidia, well in front of the median transverse diameter of 

 the head, and about four times their diameter from the anterior 

 corners. Mandibles with evenly convex external borders, the 



