- 50 Rev. L. Gurtpi1ne on the Generic Characters 
Long. corp. 11 lin.—Expans. alar. 2 un. 5% 
In honorem amici Dom. W. E. Leach, M.D. Soc. Reg. et 
Linn. Socii; inter Zoologos Europe meritó celeberrimi : 
qui genus hocce à tribulibus bené separavit propter tro- 
phorum differentiam. 
Descr. Neure majores interrupté diaphane. Punctulum albi- 
dum loco stigmatis. Antenne sub lente villosule. Thorax 
flavido maculatus. Segmenta abdominalia postice flavi- 
cantia. Genitalia hirsuta. Palpi maxillares externi apice 
emarginati, ad basin setiferi: labiales articulo incrassato 
atro. 
Larva superne nigro-fuscescens; corpore obscure spinuloso, 
capite rufescente, mandibulis : hirsutis, internè validè tri- 
spinosis, mandibularum apice unguiculisque posticis ferru- 
— gineis: capitis maculis, dorsique lineis macularibus nigris : 
 sübtüs maculis lineisque abdominis irregularibus nigris: 
anus spinosus, spinulis et seepe curvaturá 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. Folliculus orbicularis, 
operculo nullo. l 33 Pedibus 
* [s not this extraordinary and regularly shaped body allied to the acetabula found 
in crustaceous animals before the change of the crust? and which are little stores of 
calcareous matter absorbed to give solidity to the integuments? In the Myrmeleonide 
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. 
