MONOGRAPHIA 



GENUS I. PHTHIRTUS. (Leach.) 



(Pediculus of Authors.) 

 GENERIC CHARACTER. 



HEAD pandureform ; anterior part produced, roundish or 

 lobate ; apex prominent, sheathing the rostrum ; sides 

 sinuated ; base broad and rotundate. 



EYES small, somewhat prominent, situated on the sides of 

 the head immediately behind the antennae. 



ANTENNAE filiform, five-jointed ; the first the largest, the 

 remainder nearly equal. (/) 



THORAX very broad and flat, wider than the abdomen, 

 truncated anteriorly, and receiving the head in a deep 

 sinus ; sides lobate, with a single spiracle on each side 

 between the first and second pair of legs. 



ABDOMEN large, flat and cordate, intimately united with 

 the thorax, of eight segments ; the first three very minute, 

 and aggregated so as to appear as but one, but distin- 

 guished by the three spiraculi nearly in a line ; the re- 

 maining five segments large and distinct, especially at 

 the lateral margin, which has four moveable fleshy pro- 

 tuberances on each side arising from the inferior surface, 

 having their apices terminating in a fasciculus of seti. 



LEGS long, heteronomus : anterior formed for walking (k) ; 

 somewhat slender, gradually tapering ; tibia entire, 

 cylindrical; ungues long and slender; posterior four, 

 very much thickened, formed for climbing (m) ; tibia 

 larger than the femur, sinuated at the apex, and armed 

 about midway with a strong tooth ; tarsus very large, 

 conical, inarticulate, slightly curved, and tuberculate on 



