258 PROCEEDINGS OF THE ACADEMY OF [Feb., 



notum and pleurae more or less spotted with brown, and a small black 

 spot at the insertion of the forewing. Femora and tibise infiiscated 

 in the middle. Antennal club infuscated. Wings milky-hyaline, with 

 colorless veins and stigma. Concavity at summit of petiolar node very 

 distinct; postpetiole nearly twice as broad as long. Epinotal spines 

 distinctly shorter than broad at their bases. 



Male. — Length 2-2.25 mm. 



Head a little longer than broad; cheeks very short, eyes and ocelli 

 prominent. Mandibles overlapping, 4-toothed. Clypeus convex. 

 Antennae 13-jointed, scape about as long as the five succeeding joints, 

 first funicular joint about as long as the second and third together; 

 joints 3-8 slender, cylindrical, subeciual, twice as long as Inroad ; 

 club 4-jointed, the three basal joints subecjual, together as long as the 

 terminal joint. Thorax long, mesonotum rounded, projecting forward, 

 so that the head is scarcely visible when the insect is viewed from 

 above. Epinotum with a pair of slight projections in the place of 

 the spines. Petiole long and slender, like that of the worker luit with 

 lower node. Postpetiole as long as broad, square from above, in pro- 

 file with the node highest in the middle of the segment and rounded. 

 Gaster and legs of the usual conformation. 



Mandibles and clypeus subopaque, the latter coarsely rugose. Head 

 shining, very irregularly and sparsely reticulate, in front of the ocelli 

 with a few shallow foveolse. Pronotum subopaque, reticulate; meso- 

 notum very smooth and shining, finely reticulate. Scutellum and 

 epinotiun more opaque, disk of former coarsely reticulate, sides of both 

 longitudinally rugulose. Petiole and postpetiole opaque, more shining 

 above, delicately corrugated. Gaster very smooth and shining. 



Hairs white, rather sparse and long, even on the legs and antennal 

 scape, where they are reclinate but not appressed. 



Black. Mandibles, antennae and legs white except the following 

 portions, which are infuscated or blackened: Edges and teeth of man- 

 dibles, terminal joint of antennae, basal two-thirds of coxae, middle of 

 femora and tibiae and last tarsal joint. Wings like those of the female. 



Type locality: Washington, D. C. (Pergande). 



Additional localities : Morgantown, N. C. (Forel) ; Austin, Tex. ; San 

 Angelo, Tom Green County, Tex. ; Toronto, Brewster County, Tex. 



The type specimens of this fine species were taken by Mr. Pergande 

 in a nest of Monomorium minutum Mayr var. minimum, and it was 

 supposed that the Leptothorax was a guest in the nests of the Mono- 

 morium, but Forel, who observed the species in North Carolina, showed 

 that this was altogether an exceptional case. He found L. Pergandei 



