168 THYNNIDiE. 



of yellow maculae ; the apical segment ferruginous. The mandibles 

 and clypeus yellow, the latter truncate and longitudinally striated ; 

 the cheeks with white pubescence. Thorax closely punctured 

 above, and thinly covered with white pubescence ; the legs ferru- 

 ginous ; the femora more or less blackish beneath ; the coxae and 

 trochanters black ; wings subhyaline, the nervures black. Abdomen 

 with the basal segment black, the five following with a large, sub- 

 ovate, transverse macula on each side ; the upper plate of the ter- 

 minal segment ferruginous and longitudinally striated, the inferior 

 plate forming a lanceolate process transversely striated. 



Hal. Champion Bay. 



27. Thynnus rixosus. 



Male. Length 3| lines. — Black and shining, with the wings fusco- 

 hyaline. Head strongly but not very closely punctured ; the cly- 

 peus with a sharp central, longitudinal carina, and pointed at its 

 apex, and, as well as the face below the antennae, covered with 

 white pubescence. The pro- and mesothorax strongly punctured ; 

 the metathorax smooth and shining, with the apex finely punc- 

 tured ; wings fusco-hyaline, palest at their base, the nervures 

 black ; the legs obscurely rufo-piceous beneath. Abdomen sub- 

 petiolate, smooth, shining, and impunctate. 



Hah. Champion Bay. 



28. Thynnus morosus. 



Male. Length 9| lines.— Black ; the clypeus, labrum, the mandibles, 

 and a narrow line behind the eyes, yellow. Head rugose ; the 

 cheeks with white pubescence, that on the margin of the vertex 

 and prothorax pale ochraceous. The thorax closely punctured 

 above ; the metathorax with dense white pubescence ; wings f ulvo- 

 hyaline, the nervures black ; beneath with a dense white pubes- 

 cence ; the anterior coxae enlarged into large circular flattened 

 lobes. Abdomen rounded at the base, covered with fine shallow 

 punctures, and having an obscure prismatic iridescence ; the apical 

 segment with a short spine at its base laterally ; the apical ventral 

 plate with a trifid process, which has also a stout tooth at the base 

 laterally. 



Hab. Champion Bay. 



29. Thynnus impatiens. 



Male. Length 6| lines. — Black ; the head and thorax opaque and 

 variegated with yellow ; legs ferruginous ; abdomen smooth, shin- 

 ing, impunctate, and having six yellow maculae. The head and 

 thorax very closely punctured ; the anterior margin of the clypeus 



