192 MONOGRAPH I A 



Trichodectes Equi. Steph. Cat. pt. ii. p. 330. Pediculus Equi. Linn. 

 Syst. Nat. ii. 1018. Faun. Suec. 1948. Fabr. Spe. Insec. ii. 478. 9. 

 Syst. Ent. 806. 8. Stew. ii. 298. Turton. iii. 696. 



Head large, sub-quadrate ; clypeus transverse, truncate, 

 base rotundate, with two dark fasciae from the occiput, 

 united at acute angles with impressed lines to the lateral 

 margin ; eyes prominent ; antennae thick, pale tawny, the 

 third joint the longest and clavate ; prothorax transverse, 

 narrower than the head ; metathorax wider than the head, 

 base rotundate and ciliated, a semicircular impressed line 

 in the centre ; abdomen obconical, pale tawny yellow, and 

 finely pubescent, the first eight segments with a fuscous 

 transverse band on the upper half, last two segments chest- 

 nut, lateral margin with a narrow fuscous band ; legs pale 

 chestnut, thick, and strong ; tibiae very abruptly clavate ; 

 tarsi short. Length 1. 



Common on the Horse and Ass, especially when fresh 

 from pasture. 



8. TRICHODECTES LONGICORNUS. (Louse of the 

 Fallow Deer.) 



Plate XVII. Fig. 8. 



Elongate ; head and thorax bright fulvous ; clypeus 

 deeply emarginate; antennae with the second joint the 

 longest, third acute. 



Trichodectes longicornis. Nitzsch. Germ. Mag. iii. p. 296. Step. Cat. pt. 

 ii. p. 330. Burmeister Handbuch, ii. pt. ii. 436. Pediculus cervi. 

 Redi. Expe. pi. xxiii. fig. inf. The Louse of the Stag. Albin. Spiders. 

 pi. 53. fig. inf. 



Head subquadrate ; clypeus rotundate, deeply emar- 

 ginate, angles of the sinus acute and fuscous, ciliate, lateral 

 margin sinuated before the eyes, with a fuscous cuneiform 

 spot on each side connected with two longitudinal fasciae at 

 the occiput ; vertex concave, with a pale brown spot ; eyes 

 prominent ; antennae long, rather slender, with the second 



