236 PROCEEDINGS OF THE ACADEMY OF [Feb., 



a clear yellow, and in the sculpturing of the head, which is smooth and 

 shining except on the sides, where it is more opaque and reticulate. 

 The vertex is traversed by a few rather widely separated rugse. 



Female (dealated). — Length 4 mm. 



Differs like the worker in coloration. The whole body is yellow, 

 except the wing insertions, which are black. 



Type locality : Austin, Tex. 



This variety is based on a single dealated queen which was found 

 accompanied by seven workers and a few larvae in a small Holcaspis 

 cinerosus gall on a hve-oak tree. These evidently constituted an in- 

 cipient colony, remarkable because the queen and two workers were 

 pure yellow, while the five remaining workers were dark-brown with 

 black gasters, like the workers of the typical fortinodis. All the workers, 

 however, had the peculiar smoothness of the head and were undoubt- 

 edly the offspring of the same mother. I believe this colony mvist 

 present a case of hybridism, a female of the new variety gilva having 

 been fertilized by a male of the typical fortinodis. It is difficult to 

 explain the peculiar dichromatism of the workers in this little colony 

 in any other way, since the yellow workers were not callows but per- 

 fectly mature, and the queen differed so decidedly in color from the 

 majority of her offspring. Unfortunately the colony was killed by 

 dropping the gall into alcohol before the peculiarities of the workers 

 were noticed. 



The Austin specimens of fortinodis, together with those representing 

 the varieties melanoticus and gilvus, all have the petiole much smaller 

 than in Mayr's type and suggest transitions to Schaumi. Particularly 

 is this the case with var. gilvus, which is based on the female. The 

 female of Schaumi and the males of both species being unknown, I 

 am unable to dehmit the two species accurately. 

 8. Leptothorax longispinosus Roger. 



L. longispinosus Roger, Berl. Ent. Zeitschr., VII, 1863, p. ISO, No. 69. ^ . 

 L. longispinosus ]Mayr, Verb. Zool. bot. Ges. Wien, XXXVI, 1886, p. 451. 5 • 

 L. longispinosus Dalla Torre, Catalog. Hymenopt., VII, 1893, p. 125. 

 L. longispinosus Emery, Zool. Jahrb. Abth. f . Syst., VIII. 1894. p. 321. ^ $ . 



Worker (PI. XII, fig. 9).— Length 2.2.5-2.5 mm. 



Head exclusive of the mandibles not much longer than broad, 

 posterior angles considerably rounded. Mandibles 5-toothed. Eyes 

 of moderate size, rather flattened, Clypeus convex, not impressed 

 in the middle, its anterior border rounded. Antennse 11-jointed, 

 scape reacliing the posterior angle of the head, club 3-jointed; first 

 funicular joint as long as joints 2-4 together; joints 1-3 broader than, 

 long; joints 4-6 as long as broad; terminal joint as long as the two pre- 



