NEW MALLOPHAGA, 73 



short, first two segments truncated, conical, the second 

 rarely with a short appendage, the third usually pedicel- 

 lated and goblet-shaped, receiving the spherical or ovoid 

 or cylindrical fourth into this open mouth ; the fourth is 

 always the largest of the four segments ; mesothorax 

 fused with metathorax; legs long, first segment of tarsus 

 very short with a lobe of variable form, second long with 

 a small chitin plate often swollen at its extremity; abdo- 

 men differs in the sexes, both as to general form and 

 specially as to the last (ninth) segment; posterior border 

 of ninth segment of female fringed with fine hairs which 

 are not present in male. Color whitish or yellowish with 

 darker markings. This is a very large genus, infesting 

 all kinds of birds. 



Terminology. 



By means of the following definitions and accompany- 

 ing figures the student will be enabled to understand, it 

 is hoped, the special descriptive and structural terms used 

 in the synopses, keys and descriptions of Mallophaga. 

 Most of these terms are the English equivalents, as nearly 

 as possible, of the terms used in the French and German 

 monographs. A few of them are here first used. 



