HYMENOPTERA. 105 



may possibly be an extreme variety ; but, independent of the dif- 

 ference in the sculpture of the abdomen, the head is rather longer 

 behind the eyes, the thorax is much more sparingly punctured, 

 and the node of the peduncle has no deeply impressed line. 



Genus 7- PACHYCONDYLA. 



Head oblong, subquadrate, the anterior margin of the clypeus 

 rounded ; mandibles large, stout and produced, their inner mar- 

 gin denticulate ; antennae clavate ; eyes placed forward on the 

 sides of the head, ovate, and of a medium size ; the labial palpi 

 4-jointed, the maxillary palpi 4-jointed. Thorax oblong, and 

 slightly narrowed posteriorly ; the calcaria pectinate. Abdomen 

 elongate ; the node of the peduncle incrassate, quadrate or sub- 

 quadrate, elevated to the same level as the first segment, and 

 usually of nearly the same width. 



1. PACHYCONDYLA CRASSINODA. PL VII. figs. 14-16. B.M. 



Formica crassinoda, Latr.Hist.Nat.Fourm. 198. pi. 7- f. 41. A. <J , 

 D.?. 



Fabr. Syst. Piez. 40S. 51. 



St. Farg. Hym. i. 191. 3. 



Erichs. Faun, et Flo. Brit. Guiana, iii. 593. 



Hab. South America ; Demerara ; Brazil (Para). 



2. PACHYCONDYLA SIMILLIMA. PL VII. fig. 17- 



Female. Length 9 lines. Black : the head and thorax sub- 

 opake, the abdomen shining. Head as wide as the thorax, lon- 

 gitudinally striated ; the projections on the face, beneath which 

 the antennae are inserted, smooth, shining and rufo-piceous, the 

 scape obscurely so ; between the antenna? are three longitudinal 

 grooves, the central one narrowest ; mandibles very large, elon- 

 gate, bent downwards, shining and finely striated, the inner 

 margin serrated, and with a row of strong punctures. The pro- 

 thorax with a transverse curved striation ; the mcsothorax longi- 

 tudinally striated as well as the scutellum, the latter shining in 

 the middle ; the metathorax striated transversely ; the wings 

 fulvo-hyaline, the nervures ferruginous ; the legs pubescent, the 

 anterior tarsi densely so. Abdomen : the scale of the petiole 

 incrassate, transversely striated and slightly emarginate above, 

 slightly bent or curved towards the thorax. Abdomen with a 

 slight silky grey pubescence, most dense at the sides, the con- 

 striction not very deep between the first and second segments ; 



F 5 



