152 MONOGRAPHIA 



SUB-GENUS III. GONIOCOTES. (Burmeister.) 



Goniocotes, Burmeister. Goniodes, Sect. 8, Nitzsch. 

 SUB-GENERIC CHARACTER. 



HEAD large, clypeus broad and rotundate, posterior margin 

 triangular on each side, the outermost generally bearing 

 two long strong bristles ; trabeculce none ; antennae fili- 

 form, simple in both sexes ; abdomen broad, the sutures 

 faint, and ill defined in the centre. 

 This sub-genus infests birds of the Rasorial Order only. 



1. GONIOCOTES COMPAR. (Louse of the Pigeon.) 



Plate XI II. Fig. 2. 



Head large, acutely angular behind, setiferous ; abdo- 

 men white, broad and obovate ; margin ferruginous. 



Goniocotes compar. Burmeister Handbuch, ii. pt. ii. p. 431. spe. 2. Go- 

 niodes compar. Nitzsch. Gerrn. Mag. iii. p. 294. Steph. Cat. pt. ii. 

 p. 333. Pediculus Bidentatus, Scop. Ent. Carniol. 385. n. 1050. 



Head bright, tawny-yellow ; clypeus broad, circular, with 

 two short deep chestnut impressed fascia before the an- 

 tennae, lateral margin deeply sinuate, with an angular chest- 

 nut spot before the eyes, and produced posteriorly into an 

 acute angular process, bearing two long bristles, base con- 

 tracted, with two angles, occiput rotundate, with two deep 

 chestnut longitudinal impressed fascia united at the base ; 

 eyes prominent and pale ; antennae nearly filiform, the first 

 joint large and sub-globose, the second considerably smaller, 

 subclavate, the third about equal and cylindrical, last two 

 shorter, the apex with a small fasciculus of hairs ;* prothorax 



* While examining living specimens of this species, I observed that 

 though the last four articulations of the antennae appeared to have free 

 motion in all directions, the basal one in its large cavity (resembling a ball 

 and socket) seems to be seldom moved otherwise than in an upward and 

 downward direction. 



