80 HYMENOTTERA. 



striated ; the mandibles and scape pale ferruginous, the flagellum 

 pale testaceous ; the mandibles very slender at their base, their 

 inner edge finely serrated, their apex armed with two blunt teeth, 

 which are abruptly curved at right angles with the jaws ; the 

 head rather longer than broad, deeply emarginate behind, the 

 sides smooth and shining ; the legs ferruginous. Abdomen 

 smooth and shining dark rufo-piceous, w^ith the apex pale. 



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



11. ODONTOMACHUS SIMILLIMUS. PI. V. figs. 8, .9. B.M. 



Female. Length 4^ lines. Resembling O. hcematodes, with 

 the following differences : the mandibles more distinctly serrated, 

 the sulcations on the sides of the face anteriorly, not so deeply 

 impressed, or so smooth and shining, they also terminate before 

 reaching the ocelli; the line running from the ocelli to the 

 posterior margin of the vertex is not so deeply impressed ; the 

 most striking difference is to be found in the neuration of the 

 wings ; the discoidal cell is of a somewhat different form, and the 

 externo-medial nervure is straight, and unites with the trans- 

 verso-medial nervure at the basal angle of the discoidal cell ; in 

 other respects it scarcely differs from 0. hcematodes. 



Hab. Fidjee Islands ; Ceylon. 



The difference pointed out in the neuration of the wings would 

 appear to indicate a generic distinction ; but an examination of 

 a number of winged females shows a frequent approach to the 

 neuration of the present species, and in specimens of the male 

 of hcematodes, taken with the female from the same nest, by 

 Mr. Bates, the neuration is found to be identical with that of 

 O. simillimus ; in the British Museum are two specimens from 

 Ceylon which appear to be identical with the present species. 



12. ODONTOMACHUS S^EVISSIMUS. PL V. figs. 10, 11. B.M. 



Worker. Length 7 lines. Ferruginous : the mandibles of a 

 deeper tint than the head, the mouth blackish ; the deep excava- 

 tions on the face as in the 0. infandus, but the head behind 

 smooth and shining ; the central longitudinal channel very 

 deeply impressed; the mandibles serrated and toothed at the 

 apex. Thorax elongate, transversely striated, the prothorax very 

 delicately so; the abdominal peduncle terminating in a long 

 bent acute spine, and having a short blunt tooth at its base be- 

 neath; the legs pale ferruginous, with the tarsi dusky. Abdo- 

 men fusco-ferruginous, very smooth and shining. 



Hab. Cerarn. (Coll. Madame Ida Pfeiffer.) 



