REVISION or ELEODTINT BLAISDELL. 153 



General ohseroations. — The head is usually twice as wide as long, 

 and moderate in size; comparatively large in suhmtens and gorijL 

 small in stnolutu. 



Comparison and direct measurement show the head to be subject 

 to considerable variation in size, even among individuals of the same 

 species. 



The internal spurs of the meso- and uietatibia' arc sliglitly longer 

 than the external. 



The tarsi are the stoutest in ^iihri'/tciis^ moderately so in goryi^ and 

 slender in f^trioJata, f}it<\formh. and opaca; less elongate and feebly 

 robust in ithsithnis. 



After careful comparative measurements of the tarsal joints, I 

 can not present any useful facts relative to the comparative lengths 

 of the several joints of each tarsus in the different species. 



The folIoAving are my notes on the tarsi of ,si/h/iifeiis; 



In the protarsi the second, third, and fourth joints combined are 

 about equal in length to the fifth; the first is slightly longer than the 

 second. 



Mesotard. — The first joint is subequal to the third and fourth 

 taken together; the second, third, and fourth slightly decreasing in 

 length in the order named. 



Metatarsi. — The first joint is a little longer than the second and 

 third taken together ; the second very slightly longer than the third ; 

 second and third together about equal to the fourth. 



The above gives a fair idea of the ratios between the joints of the 

 ditferent tarsi. In striolata the first joint of the metatarsi is about 

 e(]ual to the second and third taken together; the second and third 

 are subequal and together slightly longer than the fourth. 



In the male of <jorj/i, the first joint of the protarsi is much thicker 

 than the succeeding ones and as long as the next two taken togetlier. 



The diiferences are so slight that they could not be utilized in the 

 determination of species. 



In the males the intercoxal process of the abdomen lies in the 

 same horizontal plane that the meta- and mesosterna do, and the abdo- 

 men behind the metacoxa^ is defiexed. As a result, its sui-face is ob- 

 lique to that of the sterna. This character is scarcely evident in Y?p«c«, 

 striolata^ very feeble in insularis, and more or less well pronounced 

 in the other species. 



In the females the abdomen is always horizontal and in some in- 

 stances slightly prominent A'entrally with the sterna. 



The relative length of the abdominal segments has to be considered. 



In the male of iiisnlariH the intercoxal process of the first abdominal 

 segment is quite (juadrate, and about equal in length to the second 

 segment; the post-coxai portion is also subequal in length to that 



