HYMENOPTERA. 269 



fuscous towards their apical marg;ins, the ner\iires dark ferrugi- 

 nous ; the legs, abdomen beneath and base above, ferruginous ; 

 the abdomen shining, punctured at the base, and on the basal 

 margins of the segments laterally; otherwise, the punctures widely 

 scattered ; an indistinct carina runs down the middle of the 

 abdomen, becoming raised and decided on the apical segment, 

 the upper plate of which is a little shorter than the lower one, 

 which is acute at the apex and slightly notched on each side ; 

 beneath, the abdomen has a similar undefined carina down the 

 centre. 



Hab. Brazil. (Coll. W. W. Saunders, Esq.) 



37. COELIOXYS SIMILLIMA. B.M. 



Female. Length 4^ lines. — Very similar to C. tridentata, but 

 the scape is entirely black, the thorax is not produced in the 

 middle, the anal valve has the inferior plate produced into a more 

 elongate spine and is not notched at the sides ; in other respects 

 it corresponds with that species, of which it possibly may be a 

 mere variety ; the male is not kno\Ma ; it may also be a variety 

 of the prcetexta of Haliday, but the description of that species is 

 tQo short to be at all relied upon in this variable genus. 

 Hah. Brazil. 



38. CCELIOXYS L^VIGATA. B.M. 



Male. Length 4\ lines. — Black, very smooth and shining ; on 

 the head and thorax the punctures are large and scattered, on 

 the abdomen they are finer and cover the basal segment, and 

 the base of all the following, a transverse line towards the 

 margins of each, the intervening portions being smooth and 

 shining ; the face covered with very pale fulvous pubescence ; 

 the tegulae and legs bright ferruginous ; the wings subhyaline, 

 their apical margins have a fuscous cloud, as well as the upper 

 half of the marginal cell ; the nervures black ; the scutellum im- 

 punctate, produced in the middle into a broad spine, which is 

 rounded at its apex ; on each side an elongate smooth spine ; 

 the apical segment of the abdomen armed with six acute spines, 

 one on each side about the middle ; four at the apex, two on 

 each side, of which the two lower spines are the longest ; all the 

 segments have a narrow white marginal fascia a little widened 

 at the sides and beneath, and more or less interrupted above ; 

 the apical margins of the ventral segments ferruginous. 

 Hab, Para. ' 



39. COELIOXYS ZONULA. B.M. 



Female. Length 6-/1 lines. — Head and thorax black, the 



