50 Rev. L. GuiLDiNG on the Generic Characters 



Long. Corp. 11 lin. — Expans. alar. 2 un. -j%. 



In honorem amici Dom. W. E. Leach, M.D. Soc. Reg. et 

 Linn. Socii ; inter Zoologos Europse merits celeberrimi : 

 qui genus hocce a tribulibus henh separavit propter tro- 

 phorum difFerentiam. 



Descr. Neura majores interrupt^ diaphanae. Punctulum albi- 

 dum loco stigmatis. Antenna sub lente villosulae. Thorax 

 flavido maculatus. Segmenta abdominalia posticfe flavi- 

 cantia. Genitalia hirsuta. Palpi maxillares externi apice 

 emarginati, ad basin setiferi : labiales articulo incrassato 

 atro. 



Larva supern^ nigro-fuscescens, corpore obscur^ spinuloso, 

 capite rufescente, mandibulis hirsutis, intern^ valide tri- 

 spinosis, mandibularum apice unguiculisque posticis ferru- 

 gineis : capitis maculis, dorsique lineis macularibus nigris : 

 subtiis maculis lineisque abdominis irregularibus nigris : 

 anus spinosus, spinulis et saep6 curvature motum adjuvans. 



Pupa villosula, nigricante-rufescens, nigro varia : membris omni- 

 bus hyalino-pallidis, oculis mandibulisque ferrugineis, ano 

 acuminato. Frons hirsuta antennis supra oculos deflexis. 

 Acetabulum * ? cinereum, nitens. FoUiculus orbicularis, 

 operculo nullo. ** Pedihus 



* Is not this extraordinary and regularly shaped body allied to the acetabula found 

 in crustaceous animals before the change of the crust f and which are little stores of 

 calcareous matter absorbed to give solidity to the integuments ? In the Myrmeleoriida 

 the acetabula consist, probably, in some degree of chitine, the superabundant part of 

 which is expelled by the pupa after its parts have acquired solidity : the centre is of a 

 softer nature, and the crust hardened and brittle. It can hardly be a calculus produced 

 by disease, as it is expelled by every individual of the family, as far as my observations 

 go : perhaps it is more nearly related to the meconium of many animals. Submitted 

 to the operation of acids, — in muriatic, these bodies undergo no change ; in nitric, they 

 are instantly dissolved with a great effervescence. In sulphuric, they are but slowly 



changed. 



