78 HYMENOPTERA. 



the head similarly sculptured ; the prothorax forming a kind of 

 neck, the meso- and metathorax elongate and straight, the sides 

 being nearly parallel, the whole transversely striated ; the legs 

 paler than the thorax. The peduncle produced above into a 

 sharp elongate spine, its base beneath also armed with a shorter 

 spine ; the abdomen as in the other sex. 



Hab. Brazil (Ega and Villa Nova). (Coll. H. W. Bates.) 



This species very closely resembles the O. qffinis of Guerin, 

 but the abdomen is black in that species, and no mention is 

 made of the spine beneath the jjeduncle of the abdomen; in 

 Guerin's species the mandibles are feebly denticulate, in this 

 they are strongly so. 



5. Odontomachus quadrispinosus. Pl.V.figs.15-17. B.M. 



Worker. Length 4^ lines. — Reddish-brown, with the coxae 

 and femora pale testaceous. The head of the same form and 

 similarly sculptured to O. maxillaris ; the mandibles two-thirds 

 of the length of the head, abruptly bent inwards at their apex, 

 which is armed with two long acute teeth, which have a third 

 short tooth in the middle of their fork. The prothorax forming a 

 neck ; the meso- and metathorax elongate and narrow, trans- 

 versely roughened, not regularly striated ; the metathorax with 

 two short spines on the verge of its truncation. The peduncle of 

 the abdomen notched at its apex, forming two short spines. 

 The abdomen with its apex pale testaceous, and having a few 

 scattered long pale hairs. 



Hab. Brazil. 



6. Odontomachus hirsutiusculus. B.M. 



Worker. Length 3^ lines. — Black : thinly sprinkled with 

 griseous hairs; the mandibles, antennae and legs pale ferrugi- 

 nous, the mandibles about half the length of the head, sliining 

 and finely denticulate on their inner edge ; the head longer than 

 broad, very finely and closely striated ; the deep lateral channels 

 on the face opposite the eyes smooth and shining, the head 

 slightly narrowed posteriorly, the hinder margin emarginate; 

 from the centre of the emargination an impressed Une runs for- 

 wards and unites with the anterior channels : on each side the 

 striation is oblique. Thorax : the )irothorax with longitudinal 

 striae, which are straight in the centre and curved at the sides ; 

 the striation on the meso- and metathorax transverse ; the scale 

 of the peduncle conical, and terminating in a single spine at the 

 summit; the abdomen elongate-ovate, smooth and shining. 



Hab. Brazil (Santarem). (Coll. H. W. Bates.) 



