130 BRITISH ICHNEUMONS. | Triphonini 

SUB-TRIBE 
TRYPHONINI. 
The utter lack of all petiole will distinguish this division from all others 
but certain Cteniscini, which differ in their lack of calcaria and certain 
Ctenopelmini, which are known by their pectinate tarsal claws. Else- 
where it can Only be confounded with certain Lissonotids, the females of 
which have the terebra at least somewhat exserted and both sexes are 
usually so evenly and closely sculptured as to present a far more uniform 
and less nitidulous surface than in the present group, where the punctura- 
tion is either so sparse as to render them strongly shining or so coarse as 
to lend the surface an uneven appearance. Many can be divided from 
the Bassides only by their mandibular structure. 
Table of Genera. 
(12). 1. First segment more or less contracted 
basally; head usually constricted 
behind. 
(9). 2. Vertex of head somewhat narrow and 
not dilated posteriorly. 
(6). 3. Basal segment narrow to apex, its 
spiracles prominent and subcen- 
tral. 
(5). 4. Areolet entire; nervellus intercepted 
below centre ot si .. LABROSSYTA, /6rst. 
(4). 5. Areolet wanting; nervellus inter- 
cepted at its centre .. SPHECOPHAGA, Westfw. 
(3). 6. Basal segment evenly explante, its 
spiracles antecentral and _ not 
prominent. 
(8). 7. Metapleurae dentate next hind coxae; 
nervellus postfurcal oy .. PROTARCHUS, Fors. 
(7). 8. Metapleurae not dentate; nervellus 
very rarely postfurcal ; MESOLEIUS, Holmgr. 
(2). 9. Vertex of head broad and somewhat 
dilated posteriorly. 
(11). 10. Second segment obliquely impressed ; 
vertex basally angulated .. ../; DYSPETES; #0757. 
(10). 11. Second segment not obliquely im- 
pressed: vertex simple .. TREMATOPYGUS, Holmgr. 
(1). 12. First segment hardly narrower basally 
than apically ; head not constricted 
behind. 
(14). 13. Petiole not basally auriculate; abdo- 
men parallel-sided ; TRYPHON, Fad/. 
(13). 14. Petiole laterally dentate at its base ; 
abdomen obconical a ., OTOBLASTUS, foérst. 
