l/li TIIYNNID.K. 



vertex. Tho anterior margin of the thorax white, slightly intcr- 

 rui)totl in the niithHe ; a spot on tho toguhr, another on the sciiteUiun 

 and on (he ])ost.soutelhini, also white; the wings hyaline, tho ner- 

 viires lerruginons. Abilonien with the lateral macula? placed nearest 

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

 three foUowing segments with interrupted white fasciae. 



Hah. Chili. 



3:?. Th3ninus 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 mandildes pale ferruginous. The mcsothorax 

 and scutellum finely and not very closely punctured ; wings hyaline 

 and iridescent, the ncrvures black ; the cox;c and trochanters black ; 

 the abdomen smooth, shining, and impunctate. 



Hah. ChiU. 



39. Thynnus nigripennis. 



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

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

 pubescence on the head, thorax, and legs black ; tho 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 tegiilae ; the scu- 

 tellum elevated, forming a prominent tubercle. Abdomen narrowed 

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



Female. Black, with tho iiagellum, 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 seg-ments 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. 



