224 Mr. J. (), \VesL\vuud"s J^eaviipllon of some 



AUe atd/cie stigniate inediocri ; cellula uiiica marginali ; tribua 

 conipletis alteraque inchoata yubinaiginalibus, liaruni cellula 

 ] ma elongata accipit, versus apicem, veiiani pvimani recur- 

 lenteni ; cellula 2da minori antice angustata accipit, pone 

 medium, venam secundam recurrentem, 3tia raajori sub- 

 quadrata. 



Pedes graciles simplices, femoribus ad basin clavatis, tarsis longis 

 gracilibus, unguibus bifidis terminatis. 



Abdomen subovale e segmentis tribus supra et infra formalum, 

 petiolo breve, segmento primo convexo, lateribus rolundatis 

 et postice coarctato, ^do subquadralo, subconvexo, laleribu;5 

 rotundatis, Stio subconico, apice rotundato. 



I greatly regret that I have only had an opportunity ot" ex- 

 amining the male sex of this insect, for the reception of which I 

 have proposed the present genus, especially as it is not to be 

 doubted that the female would exhibit as many remarkable 

 features as the male above described, which indeed offers a 

 combination of characters which wc nowhere else meet with 

 amongst the fossorial Ihjmenoplcra. The great length of the 

 antennae, the insertion of the same organs n})on a frontal tubercle, 

 the very minute size of the labrum, the angular projections at the 

 sides of the metathorax, the bifid ungues, and especially the 

 existence of only three segments in the abdomen, may all be 

 mentioned as proofs of the anomalous character of the genus, 



In respect to the natural situation of the genus it appears to 

 nie that it ought to be placed in the family Splicg'idcc, in the 

 neighbourhood of DoUchurus, which has also the antennte inserted 

 upon a frontal tubercle. It is, however, separated from that 

 genus by many characters. In other respects, especially in the 

 form of the head, collar, bifid ungues, and the construction of the 

 male abdomen, which in Chlor'ion $ has the terminal segments 

 almost obsolete, it also nearly approaches Chlor'ion, from which 

 however it is widely distinguished as a genus. In the minute 

 size of the labrum it resembles Sapyga, with which, as well as 

 with Tlphia and some other Mutillideous and Scoliideous genera, 

 it also agrees in the bifid ungues. In 'J'iphia also the first and 

 second submarginal cells respectively receive a recurrent vein, 

 but this character exists in several other genera belonging to 

 different families; from all these, however, Tr'irognia is distin- 

 guished by the arrangement of the other cells of the wings. I 

 know no other ibssorial Hymenopterous insect which has only 



