TIIYNNUS. 171 



the wings, and the metathorax posteriorly, yellow ; a large yellow 

 oblong macula beneath the wings ; wings pale fulvo -hyaline, the 

 nervures ferruginous, the tegular yellow. Abdomen narrowed at 

 the base ; the first and four following segments with narrow yellow 

 fasciae ; the three apical ones slightly interrupted beneath, black. 



Hah. Australia. 



35. Thynnus nanus. 



Male. Length 3 lines. — Black and shining, the wings hyaline and 

 prismatic, having white spots and lines. A spot at the base of the 

 mandibles, the margin of the clypeus, a line at the inner orbits of 

 the eyes as high as the antennae, a short line behind the eyes, and 

 a spot above each antenna, white. The margins of the prothorax 

 (the anterior one slightly interrupted), a spot on the scutellum, the 

 postscutellum, and the tegulae, white ; the wings hyaline and iri- 

 descent, the nervures ferruginous ; a line beneath the wings white. 

 Abdomen smooth and shining ; the basal segment with an im- 

 pressed longitudinal line ; the four following segments with a lateral, 

 oblique, longitudinal spot. 



Hah. Tasmania. 



36. Thynnus candidus. 



Male. Length 6| lines. — Black ; head and thorax closely punc- 

 tured ; abdomen smooth and shining ; head and thorax with yellow 

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

 clypeus yellow, the latter strongly punctured and with an anchor- 

 shaped black mark. The margins of the prothorax, the tegulae, a 

 small oblong spot on the disk of the mesothorax, two minute spots 

 on the scutellum, a similar spot on each side of it at its basal 

 angles, the postscutellum, and the lateral apical angles of the meta- 

 thorax, yellow ; two ovate spots beneath the wings yellow ; the 

 coxae and trochanters, the anterior and intermediate femora behind, 

 and the posterior pair at their apex above, black. The segments of 

 the abdomen slightly constricted, and having an oblong pale yellow 

 macula laterally ; the apical ventral segment triangular, with a 

 sharp spine at each angle. 



Hah. Morty Island, Eastern Archipelago. 



37. Thynnus strenuus. 



Male. Length 6| lines. — Black ; head and thorax closely punc- 

 tured, and thinly sprinkled with black pubescence : the second and 

 four following segments with white lateral oblong maculae pointed 

 within. Head with a minute spot at the base of the mandibles, 

 and also a similar one in the middle of the posterior margin of the 



