THYNNUS. 159 



testaceous ; the legs dark rufo-piceous, with the anterior and inter- 

 mediate tarsi pale testaceous ; the second segment of the abdomen 

 transversely striated, with the margins rufo-piceous. 



Hah. Adelaide. 



3. Thynnus rufopictus. 



Male. Length 5 lines. — Ferruginous ; the head, thorax, and ab- 

 domen with black markings. Head black above between the 

 eyes, the posterior margin of the vertex ferruginous ; three or four 

 of the apical joints of the anteunoe black. Thorax beneath, the 

 anterior portion, or neck, of the prothorax, and the mesothorax 

 black ; a spot on the disk of the mesothorax ferruginous : the scu- 

 tellum and postscuteUum ferruginous, on each side of them it is 

 black ; the metathorax ferruginous ; wings hyaline, the nervures 

 ferruginous as well as the tegulae. The fifth and sixth segments 

 of the abdomen black. 



Hah. Adelaide. 



4. Thynnus protervus. 



Male. Length 8| lines. — Black; the mandibles and the anterior 

 margin of the clypeus yeUow, the tips of the former black. The 

 head, thorax, and legs with hoary pubescence, which is longest and 

 most dense on the metathorax and on the sides beneath the wings ; 

 the legs ferruginous, with the coxae, trochanters, and the femora 

 above more or less black ; wings subhyaline, with the nervures 

 obscure ferruginous. Abdomen oblong, shining, the apical mar- 

 gins of the segments finely and distantly punctured ; above thinly 

 sprinkled with short hoary pubescence ; beneath it is longer and 

 much more dense ; the ajncal ventral segment triangular, the basal 

 angles acute, the apical one terminating in a short spine. 



Hah. Adelaide. 



5. Thynnus decoratus. 



Male. Length 3| lines. — Head and thorax black ; legs and abdomen 

 ferruginous, and decorated with white lines and spots. The 

 mandibles, the clypeus anteriorly, a V-shaped spot between the 

 antennae and the orbits of the eyes, slightly interrupted above, 

 Avhite. The margins of the prothorax, an abbreviated line 

 on the disk of the mesothorax, the hinder margin of the scu- 

 tellum, the postscuteUum, the tegulae, and the posterior angles of 

 the metathorax, white ; wings hyaline and iridescent ; the anterior 

 coxse, a spot on the other pairs, and two large irregular-shaped 

 maculae beneath the wings, white ; the intermediate and posterior 

 tarsi fuscous. Abdomen vnih. the basal segment black, the segments 

 with an oblique lateral white macula ; beneath immaculate. 



Hah. Adelaide. 



