186 MONOGRAPHIA 



panduriform ; clypeus transverse, with two dusky spots, 

 lateral margin sinuated, with a black spot before each eye, 

 base concave, with two depressed lines extending to the 

 vertex ; eyes black ; antennae thick, the third joint in the 

 male acutely produced ; prothorax narrower than the head, 

 rotundate before and behind, lateral margin straight, with 

 a black spot ; metathorax as wide as the head, sides rotund, 

 with a depressed line from each shoulder, base subangular, 

 with several stiff hairs ; abdomen oblong ovate, each seg- 

 ment with a narrow black lateral margin ; legs white ; tarsi 

 chestnut. Length 1J. 



This species was also communicated by my brother, who 

 took it from the same species of Bird as the last. 



GENUS II. TRICHODECTES. (Nitzsch.) 



Burmeister. Stephens. Pediculus. Linn, Fabriciua, Schrank. RiciniLt. 



De Oeer. 



GENERIC CHARACTER. 



HEAD depressed, scale-like, horizontal, wider than the pro- 

 thorax, mouth beneath ; lateral margin sinuate. 



MANDIBLES strong ; apex bidentate. 



LAJBRUM dilated at the base, inflated, changeable in appear- 

 ance, margin free, slightly notched. 



LABIUM small, less dilated, margin free, slightly notched. 



MAXILLARY PALPI none or inconspicuous. 



LABIAL PALPI very short and two jointed (h). 



ANTENNA filiform, three jointed, in the males of some spe- 

 cies slightly clavate and somewhat cheliform, terminated 

 by a fasciculus of hairs. 



EYES placed on the lateral margin of the head behind the 

 antennae, in many cases inconspicuous or absent. ? 



THORAX of two segments. 



