52 THYNNID^. 



Family THYNNID^. 



The insects belonging to the typical genus Thynnus are chiefly 

 Australian, none being found within our limits. The males of all 

 the Thiinnida' are winged, the females apterous. Two Indian 

 genera, MetJwca and Isivara, are related to Thynmia and are classed 

 generally in the family TJn/nnida;. Iswara is also allied in form 

 and in the venation of the wings to Myzlne, a genus of i\\e Scolnda>,. 



Head in female small, in male the M'idth of the thorax ; thorax 

 in female subrectangular, constricted posteriorly, in male oval, the 

 pronotum reaching back to the base of the wings ; abdomen more 

 or less massive, the anal segment in the male of the two genera 

 found in India with an up-curved spine. 



Key to the Genera. 



a. Marp-ins of the abdominal segments strongly con- 

 stricted in the male Methoca, p. 52. 



h. IMargins of the abdominal segments not con- 

 stricted in the male . Iswara, p. 54. 



Genus METHOCA. 



Methoca, Latr. Hist. Nat. Ins. xiii, p. 268, $ (1805). 



Mutilla, pt., Jurine, Hym. p. 266 (1807). 



Tenygra, Latr. Gen. Crust, et Ins. iv, p. 115, S (1809). 



Type, M. ichneumonoides, Latr. 

 Mange. Both hemispheres. 



2 . Head subglobose ; eyes oval ; ocelli in a triangle on the 

 vei'tex ; antennae filiform, inserted low down just above base o£ 

 clypeus, their bases somewhat widely 

 separated, the flagellum aboat the length 

 of the thorax ; clypeus subtriaugular ; 

 mandibles curved. Thorax doubly con- 

 stricted, rounded at the base and apex ; 

 legs long and slender, the coxae very 

 robust ; femora subclavate ; the tarsi 

 ■p- « elongate. Abdomen ovate, petiolate. 



Methoca smith'ii, (S . %. S- Head transverse, broad, flat an- 



teriorly, convex behind ; eyes prominent ; 

 ocelli large ; antennae filiform, the scape short, the joints of the 

 flagellum beyond the 3rd slightly arched. Thorax elongate oval, 

 sometimes considerably narrowed posteriorly ; fore wing with one 

 radial and three cubital cells, the radial cell elongate, the apex 

 nearly reaching the apex of the wing, the first transverse cubital 

 nervure faint, in some specimens almost obsolete, the 2nd cubital 

 cell narrowed towards the marginal, the 3rd cubital cell the longest 

 and narrowed at apex towards the marginal ; legs moderately 



