J903.] NATURAL SCIENCES OF PHILADELPHIA. 239 



my material the thorax of the worker is black, and the head rather 

 smooth so as to resemble the forms described by Emery from New York 

 and by Mayr from Virginia. 



L. longispinosus appears to he confined to the Eastern United States. 

 At any rate I have not yet been able to find it in the ]\Iiddle West or 

 among my material from the Western States. At Colebrook, Conn., 

 the workers of this species are often seen running over the leaves or 

 bushes in rather damp, shady places. The nests, containing the winged 

 females and males in August, were found in clefts of granite boulders 

 and in worm-eaten hickory nuts on the ground under the trees in the 

 woods. Some of the colonies were quite populous for Lcptothorax colo- 

 nies, others very small. 



9. Leptothorax curvispinosus Mayr. 



L. curvispinosus Mayr, Sitz. B. k. Akad. Wiss. Wien, LIII, 1866, p. 508. ^ . 



Stenamma gallarum Patton, Am. Natural., 1879, p. 126. ^ 9 . 



L. curvispinosus Mayr, Verhand. zool. bot. Ges. Wien, XXXVI, 1886, 



pp. 451 and 453. '$ . 

 L. curvispinosus Dalla Torre, Catalog. Hymenopt., VII, 1893, p. 124. 

 L. curvispinosus Emery, Zool. Jahrb. Abth. f. Syst., VIII, 1894, pp. 317 



and 320. 



Worker (PI. XII, fig. 10).— Length 2-2.5 mm. 



Mandibles 5-toothed. Clypeus moderately convex, with broadly 

 rounded anterior border, without median impression. Antennae 

 11-jointed, scape reaching to midway between the eye and the posterior 

 corner of the head; funiculus terminating in a distinct 3-jointed club; 

 first funicular joint nearly as long as the three succeeding joints 

 together; joints 2-7 about as long as wide; terminal joint little longer 

 than the two preceding joints of the club taken together. Thorax 

 but little broader in front above than below and behind; humeri 

 shghtly angular; dorsum convex, without promesonotal and meso- 

 epinotal sutures and without a constriction at the latter region. Epi- 

 notal spines long and slender, tapering rather rapidly at their tips; 

 directed backward and slightly upward, their tips incurved and 

 slightly converging. Petiole from above more than twice as long as 

 broad, distinctly narrower at the anterior peduncular end than behind; 

 node in profile rather blunt, with longer and slightly concave anterior 

 slope and convex posterior slope; lower surface laterally compressed, 

 with a small but distinct downwardly directed tooth near the anterior 

 end. Postpetiole globose, about half again as broad as the petiole, 

 almost circular when seen from above. Gaster short, elliptical, with 

 small but distinct basal angles. 



Mandibles shining, with indistinct longitudinal strise. Clypeus 

 longitudinally rugose, even in the middle. Head opaque, covered 



