592 PROF. WESTWOOD ON SOME 



Oligosita ? NODICORNIS. (PL LXXIII. fig. 22.) 



Tota fulvo-lutea, oculis obscuris, venis alarum pedibusque pallide luteo-albis ; capitelato; antennis 

 brevibus, geniculatis, articulo primo elongato, secundo brevi obconico, 4 proximis semiovalibus, 

 fere sequalibus, singulo secundo parum majore, setis longis antice subverticillatis, articulo apicali 

 (septimo) ovali, quam prsecedens paulo minore; alis anticis magnitudine ordinaria, angulo antico apicali 

 rotundato-truncato, longe ciliatis, disco parum setoso, setis in lineas 5 irregulariter dispositis ; alis 

 posticis angustis utrinque longe setosis, angulo hamifero costali conico ; genitalibus masculinis 

 porrectis quasi biarticulatis, parte basali subtus spina armata. An mas 01. Staniforthii ? Long, 

 corp. 0014 unc. 



Habitat cum praecedente in Taprobana (D. Staniforth Green) . 



I am obliged to add a mark of interrogation to the generic name applied above to this 

 insect, from ignorance of tbe true structure of the male antennae of the type of Oligosita. 

 The specimen before me is a male, as shown both by the exserted genitalia and the 

 structure of the subverticillated antennas (fig. 23), with the terminal joints not forming a 

 triarticulated mass. 



Trichogramma (Aprobosca) erosicornis. (PI. LXXIII. fig. 24.) 



Corpus breve, contractum ; abdomine sessili; capite magno ; antennis brevibus, geniculatis, articulo primo 

 longo, secundo parvo semiovali, tertio minimo annuliformi, ultimo (quarto) elongato, valde irre- 

 gulari, quasi eroso, subnodoso, nodulis verticillatis ; mandibulis angustis, curvatis, apice bidentatis; 

 maxillis cum labio massam ovalem apice breviter setosam formantibus palpisque brevibus exarticulatis 

 instructam; pedibus sat longis, tarsis 3-articulatis, pulvillo magno ; alis anticis latis, ciliis mediocriter 

 elongatis marginatis, ramo stigmatico elongato, apice crassso inflexo, setis disci in lineas circiter 10 

 dispositis; alis posticis- angustis, fere linearibus, longius ciliatis, angulo hamifero costali prominente. 

 Tota fulva, oculis obscuris, pedibus antennisque pallidioribus. Long. corp. 0'018 unc. 



Habitat in insula Taprobana (D. Staniforth Green) . 



The form of the fore wings, which are relatively broad, and the linear arrangement of 

 the fine hairs on their disk, prove that this curious insect must be closely allied to our 

 English Trichogramma ; but the singular antennae (fig. 25), of which the terminal nodose 

 portion under my strongest power shows no trace of transverse articulation (although 

 the groups of verticillate hairs might be supposed to indicate so many joints which 

 have become ankylosed), render it necessary to form at least a separate subgenus for 

 its reception. In favour of the exarticulation of this terminal part, the genus Thysanus, 

 described by Haliday *, may be quoted, in which the terminal joint is exarticulated, 

 elongated, and cylindrical ; it has been placed in the section Tetrastichoidse by Poerster. 

 The antennae appear, at first sight, to consist of only three joints, of which the last is 

 very long and linear, especially in the males; but between the second and third joints 

 there appear to be three very minute annuli (more distinctly shown in the figure of the 

 female than in the male antennae f ). The tarsi are not described, except that the inter- 

 mediate pair are said to be "lorjgissimi" (very long) ; the detached figure of one of the 

 tarsi represents it as five-jointed, with a scarcely visible pulvillus ; but Poerster states 



* Annals Nat. Hist. iv. 234, December 1839. This name has been unnecessarily (as it seems to me) altered by 

 Foerster to Triphasius (Hymen. Studien, p. 84). 



f ' Entomologist,' No. 26, December 1842, plate K. fig. 3a male, fig. 3 6 female antenna; fig. 3c tarsus. 



