102 GEO. H. HORN, M. D. 



H a r p a 1 i n i. In a comparatively few genera the coxae are plainly 

 separated and the small triangle of the first ventral segment becomes 

 visible between them. This character is scattered in all parts of the 

 series. In Brachymis it seems to lose its value as species occur with 

 the coxse contiguous or separated. In Trachypnchys alone the coxae 

 externally reach the side margin of the body. This character is usual 

 in all the following families but unique here. 



Abdomen. — There are always six segments, the first lateral. Their 

 length varies but not to an extent to afi"ord systematic characters. 

 In Brachynus there are said to be seven or eight segments but this 

 is sufficiently discussed in that tribe. 



Each of the first five segments bears near its posterior edge and on 

 each side of the middle a puncture bearing an " ambulatorial seta." 

 The last ventral is apt to vary sexually in its punctuation and the males 

 will be seen to have but one puncture each side and the females two. 

 Other sexual modifications of the last ventral are often observed, but 

 these have more often a specific than generic value. 



Legs. — The only specially important variation is found in the anterior 

 tibiae whether emarginate or not on the inner side and with this the 

 position of the terminal spurs. In some genera the anterior tibi« are 

 grooved on the inner side in the axis of the member, these have the 

 spurs of necessity terminal. It will be observed then that the greater 

 the obliquity of the groove the more one spur is elevated so that when 

 the emargination is most perfectly developed the inner spur is at the 

 upper angle of the emargination. The tibial spurs are always present, 

 sometimes very short {Agra), or very long {Tetragonoderus), and in the 

 latter genus finely serrulate. There are two spurs, never more, notwith- 

 standing the assertion to the contrary in Zahnis. 



Tarsi. — The feet are five-jointed without exception, the joints varying 

 among themselves in form and size, and many times afford a useful resort 

 for separating genera. The vestiture of the under side is variable generi- 

 cally and again sexually. The mode of dilatation of the anterior male 

 tarsi and the vestiture of the dilated joints whether squamulose, papillose, 

 pubescent, spongy or spinous, gives at times the only constant character 

 for the separation of groups of genera. 



As a rule the anterior tarsi of the male are dilated in from two to four 

 joints while it often happens that the sexes can not thus be separated. 



Ungues. — The claws are more often simple than otherwise but 

 numerous instances occur in which they are dentate, serrate or pectinate. 

 These variations are useful for the separation of genera. 



