POLYRHACIIIS. 



opaque ; pubescence almost entirely absent except a few scattered 

 erect hairs on the front of the head and on the apical segments of 

 the abdomen. Head broadly oval ; clypeus with a distinct medial 

 vertical carina, and briefly lobed, the anterior margin incised in 

 the middle ; antennal carinae wide apart, not divergent. Thorax 

 narrower than the head, compressed posteriorly, pronotum and 

 inesonotum longer than broad ; pronotal spines very short and 



Fig. 134. Polyrhackie simplex, 



thick, directed obliquely outwards ; rnetanotal spines erect, slightly 

 divergent, the apex slightly bent outwards ; legs stout, tibiae without 

 hairs or spines, except towards the apex where there are three or 

 four on the underside. Node of pedicel broader than long, 

 biconvex, with two spines curved to the shape of the abdomen 

 on the upper lateral angles, and to obtuse points or teeth in the 

 middle between them : abdomen short, very convex above, globose. 



$ . Very similar ; the mesonotum and scutellum rather coarsely 

 punctured, pronotal spines very short, metanotal and pedicel spines 

 shorter than in the and more massive ; wings hyaline, with a 

 slight yellowish tint. 



c? . Abdomen shining, the head and thorax opaque, the base of 

 the metanotutn with a slight longitudinally impressed line, thorax 

 and node of the pedicel unarmed. Wings subbyaline. 



Length, 4-5-7 ; $ 8 ; J 7 mm. 



Hob. Found throughout our limits ; nearly the most common 

 species of the genus. 



467. Polyrhachis bicolor, Smith, Cat vi (1858), p. 65, $; Forel,Jour. 

 Bomb. N. H. Soc. viii (1893), p. 26, $ . 



. Head, thorax and node of pedicel black ; antennae, mandibles, 

 legs and abdomen light red ; the whole insect covered with a fine 

 silky yellowish-white recumbent pubescence, fairly long and dense, 

 hiding the sculpture. Head broader above than below, the cheeks 

 only slightly convex ; eyes round, very prominent. Thorax very 

 convex in front ; pronotal and metanotal spines short, slender and 

 very acute ; legs long and slender, covered with soft, very fine, 

 long erect hairs. Node of the pedicel longer than broad at base, 

 surmounted by two slender erect spines at its lateral angles, which 

 are longer than either the pro- or metanotal spines ; abdomen very 

 convex above. 



