184 GEO. H. nORN, M. D. 



The pygidium is always much longer in the male, the form heing 

 elongate oval in the one case and broadly triangular in the other. 



The anterior and posterior tibia) of the male are without spurs. 

 There are however, stiff bristles around the end of the hind tibiie 

 which simulate spurs, but no proper spurs. The middle tibia3 have 

 two well defined spurs. In the female the tibiae are all normally 

 provided, that is, the anterior have one and the four posterior two 

 each. 



In the male the post coxal portion of the presternum is elevated in 

 a long and rather slender process, that of the female is entirely flat 

 and without elevation. The abdominal segments 2 — 5 of the male 

 have on each side of the middle an oblique I'ow composed of three or 

 four coarse punctures, bearing a stiff and nearly erect bristly hair. 

 The females have a few slender hairs usually arranged without any 

 marked regularity. 



The claws of the male, especially those of the anterior tarsi, are 

 very much less cleft than those of the female, and are longer and 

 much less curved. 



The discovery of the sexual relations of our species has required a 

 rearrangement of the synonymy, and the following notes are the result 

 of their study. 



Males. — Anterior and posterior tibiae without spurs, prosternum behind thecoxsB 

 elevated in a long process, abdomen with stiff hairs arranged in oblique rows 

 on each side of the middle of segments two to five, pygidium elongate. 

 Thorax always with recumbent pubescence. 



Prosternal process long, slender, as long as the coxae and visible from 



the front; abdominal bristles slender SUbsplROSUS. 



Prosternal process short, not visible from the front; abdominal bristles 



very short aiignsfatus. 



Prosternal process long, visible from the froat, tip broader and emar- 



ginate; abdominal bristles stout uniformis. 



Females. — Anterior and posterior tibiae with spurs, prosternum not elevated 

 behind the coxae; abdomen with a very few slender hairs, pygidium tri- 

 angular. 



Thorax with recumbent hairs with short vertical setae intermixed, ab- 

 domen with very few median erect hairs subspinosus. 



Thorax with all the hairs of the disc erect, those of the margin recum- 

 bent, abdomen with many erect hairs along the middle arising from 



strong punctures aiigiistatus. 



Thorax with the hairs all recumbent as in the male, abdomen with few 

 erect hairs arising from small punctures unirormis. 



^I. MubspinoMii$«, Fab. 



Feuiales of this species very rarely occur with the pubescence of 

 the thorax flat as in the male, they then resemble unij'ormis which 



