172 THYNNTDiE. 



vertex. The anterior margin of the thorax white, slightly inter- 

 rupted in the middle ; a spot on the tegulse, another on the scutellum 

 and on the postscutellum, also white ; the wings hyaline, the ner- 

 vures ferruginous. Abdomen with the lateral maculae placed nearest 

 to the posterior margins of the segments ; beneath, the second and 

 three following segments with interrupted white fasciae. 



Hah. Chili. 



38. Thynnus nigrofasciatus. 



Male. Length 4^ lines. — Head and thorax shining black ; legs and 

 abdomen ferruginous, the latter with the basal and the fifth seg- 

 ments black. The mandibles pale ferruginous. The mesothorax 

 and scutellum finely and not very closely punctured ; wings hyaline 

 and iridescent, the nervures black ; the coxae and trochanters black ; 

 the abdomen smooth, shining, and impunctate. 



Hah. Chili. 



39. Thynnus nigripennis. 



Male. Length 9-10 lines. — Jet-black ; head and thorax opaque, 

 the abdomen shining. The joints of the antennas subarcuate ; the 

 pubescence on the head, thorax, and legs black ; the head and 

 thorax closely punctured ; wings dark fuscous, and with a violet 

 iridescence ; the mesothorax with two deep longitudinal channels, 

 and two abbreviated narrower ones towards the tegulse ; the scu- 

 tellum elevated, forming a prominent tubercle. Abdomen narrowed 

 at the base, subpetiolate, and very smooth and shining. 



Female. Black, with the flagellum, anterior tibiae in front, and the 

 tarsi fulvous ; above the insertion of each antenna is a broad, arched, 

 yellow macula ; the head and thorax not closely punctured ; the 

 basal segment of the abdomen strongly punctured, and with a. tuft 

 of fulvous pubescence at its base ; the second segment rugose, the 

 following segments finely and distantly punctured ; the extreme 

 apex ferruginous. 



Hah. Chili. 



40. Thynnus macilentus. 



Male. Length 5 lines. — Head and thorax shining black, abdomen 

 and legs ferruginous. Head finely but not very closely punctured ; 

 the mandibles and palpi white. Thorax not strongly or closely 

 punctured ; the margins of the prothorax white, and slightly inter- 

 rupted in the middle ; wings hyaline and iridescent, the nervures 

 black ; the coxae and trochanters black. Abdomen smooth and 

 shining, and having a black macula on the basal segment. 



Hah. Chili. 



