THYNNITS. 163 



14. Thynnus excellens. 



Male. Length 5| lines. — Ferruginous, and with white and black 

 markings. The antennae black ; the mandibles, the clj^peus, the 

 inner orbits of the eyes, a spot above each antenna, and the lower 

 portion of the outer orbits of the eyes, white ; a longitudinal fer- 

 ruginous line on the clypeus. The prothorax with the margins 

 white between them, black above in the middle, and ferruginous 

 laterally ; a white spot on the disk of the mesothorax with a 

 black line on each side ; the tegulae and a narrow line over them, 

 the postscutellum, and a narrow line up to the insertion of the pos- 

 terior wings, white ; the metathorax black above, with the posterior 

 lateral angles and two central ovate spots white ; wings hyaline ; 

 the prothorax beneath and the pectus black; the anterior coxae 

 with large white spots ; the intermediate and posterior tarsi, also 

 the posterior coxae and femora above and the apex of the tibiae, 

 black. Abdomen with the margins of the segments deeply con- 

 stricted ; the extreme base black ; the first to fifth segments with 

 lateral white subovate maculae, and also a double central row of 

 minute ones ; the abdomen is somewhat similarly spotted beneath. 



Hah. Swan River. 



15. Thynnus insidiator. 



Male. Length 7 lines. — Head and thorax black, legs pale ferrugi- 

 nous ; abdomen yellow, with the base and the extreme base of each 

 segment narrowly black. The mandibles, the clypeus, the mar- 

 gins of the eyes (narrowly interrupted at their summit), and a 

 V-shaped spot between the antennae, yellow. The anterior margin 

 of the prothorax narrowly, and the posterior margin broadly, 

 yellow ; a quadrate spot on the disk of the mesothorax, the tegulae, 

 scutellum, and postscutellum, yellow ; the legs pale ferruginous ; 

 the anterior coxae at their base, and the intermediate and posterior 

 pairs black ; wings fulvo-hyaline the nervures at the base of the 

 wings ferruginous, beyond they are black. The segments of the 

 abdomen have laterally a short ferruginous longitudinal line, an 

 indistinct central similar row of lines, and also a short transverse 

 line near the apical margin of each segment between the lon- 

 gitudinal rows. 



Female. Length 4 lines. — Black above and ferruginous beneath; 

 the antennae and legs ferruginous ; the margins of the segments 

 above ferruginous ; the apical segments punctured ; the head, 

 thorax, and base of the abdomen smooth and shining, and with a 

 few fine scattered punctures. 



Hab. Swan River. 



M 2 



