406 Mr. F. Smith's descriptions 



Genus Leptothoeax, Ma}T. 



1. Leptothorax congruus. 



Worker. — Length 1 ^ line. Black-brown; head oblong, 

 eyes about the middle, lateral ; the base of the scape of 

 the antenna3 and the flagellum rufo-testaceous ; the three- 

 jointed club dark fuscous ; the head longitudinally finely 

 striated. Thorax finely rugulose ; the base of the femora 

 and of the tibiae, and also the tarsi, pale rufo-testaceous ; 

 the thorax is narrowed posteriorly, where it is armed with 

 two short spines. Abdomen smooth and shining, truncate 

 at the base. 



Hab. — Hiogo. 



This insect is like L. acervorum, but smaller. 



Genus MoNOMORiUM, Ma}T. 

 1. Monomorium intrudens. 



Worker. — Length 1 line. Head yellowish-chestnut, 

 very smooth and shining ; eyes minute, placed at the sides 

 of head anteriorly ; the club of the antennee tlu-ee-jointed 

 and rather darker than the head. The thorax, legs and 

 nodes of the peduncle pale yellow. The extreme base of 

 the abdomen pale, the rest of it nearly black. 



Hub. — Hiogo. 



This minute ant is probably, like two or three of the 

 species of the genus, found in houses ; the common house 

 ant found in many London houses belongs to the same 

 genus. The species are remarkable for not having any 

 suture between the pro- and meso-thorax, and the meta- 

 thorax is not spined. 



Genus Pheidole, Westw. 

 L Pheidole fervida. \/ 



Female. — Length Z\ lines. Pale chestnut-colour, the 

 mandibles of a brownish-black, punctured, very stout and 

 with two teeth at their apex ; head about the same width 

 as the thorax ; longitudinally striated and slightly emar- 

 ginate behind. Thorax ovate, rather longer than broad, 

 shining and flattened above ; the scutellum smooth and 

 shining ; legs paler than the body. Abdomen ovate, 

 smooth and shining, the apical margins of the segments 

 pale. 



