12 MONOGRAPHIA 



GENUS II. PEDICULUS. 



Linn. Fabr. De Geer. Geoff. Redi. Hermann. Swam. Lam. Leach. Step. 

 Nitzsch. Burmeister. 



GENERIC CHARACTER. 



HEAD flattened, subglobular, produced in front ; mouth at 

 the extremity, lateral margin deeply sinuated before the 

 antennae, occiput somewhat acuminate. 



HAUSTELLUM retractile within the head, when at rest, 

 consisting of a soft tubulose sheath (e), capable of great 

 extension at the apex (/) ; armed with a double series of 

 minute horny hooks (g} } from the centre of which pro- 

 ceeds four bristles converging to e'ach other at their points 

 and forming a tube (h).* 



ANTENNAE filiform, of five joints, the second the longest, 

 the remainder equal, the last joint terminated by a fasci- 

 culus of bristles. 



PALPI none. 



EYES prominent, simple '( situated on the lateral margin 

 of the head, about midway between the antennee and 

 the occiput. 



THORAX narrower than the abdomen, sub-conical, with 

 the pro-thorax, meso-thorax, and meta-thorax, indistinctly 

 indicated, with a single spiracle between the first and 

 second pair of legs, on each side of which is a setiferous 

 papilla. 



ABDOMEN large, flat, indistinctly separated from the thorax. 

 The segments seven in number, well defined at the 

 lateral margin, but obscure in the centre ; surface beauti- 

 fully papillose, having the appearance of chagreen; 

 spiracles always six and placed upon the first six seg- 



* The letters refer to the dissections in plate 26. 



