THYNNUS. 1 73 



41. Thynnus intaminatus. 



Male. Length 5 lines. — Shining jet-black ; the head and thorax 

 thinly sprinkled with black hairs, finely but not very closely punc- 

 tured ; wings fusco-hyaline, and having a violet iridescence ; abdo- 

 men with the segments slightly constricted, and smooth, shining, 

 and impunctate ; the prothorax has beneath a central sharp, longi- 

 tudinal carina. 



Hal. Chili. 



42. Thynnus albofasciatus. 



Male. Length 8 J lines. — Black ; head and thorax very closely 

 punctured ; abdomen closely but much more finely so, and with an 

 impunctate white fascia on the second, third, and fourth segments ; 

 the fasciae attenuated in the middle and near the apical margins 

 of the segments. The anterior margin of the prothorax white ; 

 the legs ferruginous ; wings fulvo-hyaline, the anterior pair with 

 a fuscous cloud in the marginal cell and extending a little below 

 it, this part of the wings with a violet iridescence ; the nervures 

 from the base of the wings to the marginal cell ferruginous, beyond 

 the stigma they are black. 



Hal. Chili. 



43. Thynnus ingenuus. 



Male. Length 7 lines. — Black, much adorned with yellow mark- 

 ings ; the head and thorax closely punctured ; abdomen more 

 strongly but more distantly punctured. The clypeus and a spot at 

 the base of the mandibles yellow. The margins of the prothorax, 

 which unite in the middle and have a central black spot, the 

 tegulse, a macula on the mesothorax at the base of the scutellum, 

 the hinder portion of the latter, the postscutellum, and two broad 

 stripes on the metathorax, which curve round to its lateral poste- 

 rior angles, yellow ; an oblong spot beneath the wings, the ante- 

 rior femora in front, and the intermediate and posterior pairs 

 towards their apex beneath, yellow ; the wings hyaline, their ner- 

 vures ferruginous. All the segments of the abdomen with a large, 

 oblong, lateral macula, the maculae with a small ovate notch in 

 their outer margin ; beneath, the second, third, and fourth segments 

 with a small lateral yellow macula. 



Hal. Bay of St. Bias, North Patagonia. 



