54 Mr. F. Smith on new Species 



Family Sphegidse. 

 Genus Trigonopsis, Perty. 



Trigonopsis cydocephalus. 



Male. Length 8 lines. Head and thorax black ; abdomen 

 ferruginous, with the petiole black ; anterior wings with two 

 light-brown fascire. Head slightly narrowed behind, smooth, 

 shining, and impunctate ; the sides of the face and the clypeus 

 covered with golden pubescence ; the latter produced into two 

 teeth at its anterior margin, which, as well as the mandibles, 

 are ferruginous ; the latter black at their tips ; the scape of 

 the antennas pale ferruginous, and the two following joints of 

 the flagellum obscurely ferruginous beneath; the prothorax 

 smooth, shining, and narrowed anteriorly into a short neck ; 

 its posterior margin fringed with silvery hairs, and in the 

 middle it is elevated into a slight tubercle ; the anterior and 

 intermediate tibijB and tarsi ferruginous ; the anterior femora, 

 and the other femora more or less, ferruginous at their apex. 



Hah. Ega. 



This species is very distinct from all those that have a 

 similar coloration — namely, the typical one {T. rufiventris)^ 

 T. ajim's, and T. tnterjnedius, described by Saussure in ' Reise 

 der Novara.' It is distinguished from the type by its shorter 

 and romider head, by the pale tibias and tarsi, its shorter neck 

 and metathorax, the latter being covered with transverse 

 stria?. From the male of T. affinis it is at once distinguished 

 by the ferruginous scape of the antennas, and by its having 

 the teeth and anterior margin of the clypeus also ferruginous ; 

 it has the second submarginal cell square and larger, and its 

 legs are differently coloured. From T. intermedins it will 

 prove to differ ; but the male of that species is not 



Trigonopsis plesiosaurus. 

 Female. Length 7 lines. Elongate and attenuated ; head 

 and thorax shining black ; abdomen red. Head narrowed 

 behind, the sides nearly parallel, or only slightly widest 

 anteriorly ; the clypeus and face with a golden pile ; the 

 anterior margin of the cl}^eus with fom- teeth, the outer pair 

 stoutest and longest ; the mandibles arcuate, and, as well as 

 the scape of the antennas in front, ferruginous, as are also its 

 extreme base and apex. Thorax smooth, shining, and forming 

 a long neck with a deep central abbreviated channel at its 

 base ; the mcsothorax with scattered large deep punctures ; 



