166 THYNNIDJE. 



21. Thynnus molestus. 



Male. Length 7| lines. — Black, marked with yellow on the head, 

 and sparingly so on the abdomen ; the tibiae and tarsi ferruginous. 

 The mandibles, clypeus, a line from it that unites with a broad 

 line at the inner margin of the eyes, as high as the antennae, a 

 minute spot above them, and a broad stripe behind the eyes, yellow. 

 Thorax closely punctured; the wings subhyaline, the nervures 

 yellowish at the base of the wings. Abdomen shining, finely and 

 closely punctured ; a minute yellow macula at the lateral margins 

 of the second, third, and fourth segments. 



Hah. South Australia. 



22. Thynnus strangulate. 



Male. Length 4 lines. — Shining black, the segments deeply con- 

 stricted. Head punctured ; the clypeus much produced, its anterior 

 margin truncate, its extreme lateral margins narrowly white ; a 

 spot at the base of the mandibles white. Thorax sparingly punc- 

 tured ; the wings hyaline and iridescent ; the anterior tibiae pale 

 rufo-testaceous. Abdomen shining and impunctate. 



Female. Ferruginous and shining ; the metathorax dark fuscous ; 

 the apex of the abdomen black ; the head compressed, smooth, and 

 shining, widest anteriorly. 



Hah. South Australia. 



23. Thynnus pavidus. 



Male. Length 5 lines. — Black ; the head and thorax with yellow 

 markings ; the base of the antennae and the legs ferruginous. The 

 clypeus and mandibles reddish yellow ; the former, with the base 

 and two minute spots, black ; the tips of the mandibles black. 

 The margins of the prothorax yellow, the hinder margin broadly 

 so, and uniting with the anterior margin, which is slightly inter- 

 rupted in the middle ; the scutellum, postscutellum, and a narrow 

 line from the latter to the base of the posterior wings, yellow ; the 

 mesothorax finely punctured ; the metathorax transversely striated 

 beyond the base, which is smooth and shining ; wings hyaline, the 

 nervures dark fuscous, becoming ferruginous towards their base ; 

 the coxae black. Abdomen shining black, impunctate, with the 

 margins of the segments depressed. 



Female. Black ; the head smooth and shining ; the mandibles, an- 

 tennae, legs, and second segment of the abdomen ferruginous, the 

 latter transversely grooved ; the apex of the abdomen ferruginous. 



Hah. South Australia. 



