266 GEO. H. HORN, M, D. 



The group Colones contains but two genera thus far described, 

 one only occurs in our fauna, the other is from Auckland, N. Z., 

 they are distinguished in the following manner : 



Antennae gradually clavate, eighth joint not narrower nor shorter than the 

 contiguous joints; last joint of maxillary palpi slender Colon. 



Antennse very slightly thicker externally, eighth joint shorter and a little 

 narrower than the seventh and ninth; last joint of maxillary palpi dilated, 

 subseeuriform Camiarus. 



The genus Camiarus presents all the essential features of the tribe 

 Cholevini as defined in the present paper, and must be referred to 

 the present group by the form of the head and the structure of the 

 abdomen. It is however, somewhat of a synthetic type, presenting a 

 structure of antenna more nearly resembling that seen among the first 

 two groups than of the Cholevae taken collectively. I am not able 

 to perceive the relationship with the Scydmaenidae which Dr. Sharp 

 intimates, although one of the species does certainly resemble a robust 

 Eumicrus in facies. The dissimilarity in form of the two species 

 seems to indicate the occurrence of others. For specimens I am 

 indebted to the great liberality of Dr. Sharp to whom we owe our 

 knowledge of them, (Ent. Mo. Mag. xiii, p. 23). Figures of the two 

 species will be found on PI. VI, fig. 24 — 25. 



COLON Herbst. 

 Form oblong-oval, usually moderately convex. Head oval, not narrowed 

 behind the eyes, occiput not elevated. Eyes nearly round, moderately promi- 

 nent. Antennse rarely passing the middle of the thorax, first joint moderately 

 stout not long, second nearly as stout but shorter, third more slender than the 

 second and variable in length, joints 4 — 7 usually short, gradually wider, 8 — 11 

 forming an oblong moderately compact club. Last joint of maxillary palpi 

 slender, subulate. Middle coxse separated, the mesosternum not carinate, pos- 

 terior coxse contiguous. Tarsi slender, the middle and posterior usually com- 

 pressed, and with the first joint somewhat shorter than the second, the anterior 

 usually dilated in the male. Tibiae spinulose, the spurs in the male broader 

 from middle to base or in the anterior tibia dentate at the sides. Abdomen with 

 five segments, the terminal often retracted and showing but four. 



This genus is separated from all others in the tribe by the structure 

 of the antennae, head and abdomen. 



In most if not all of the books the mesosternum is said to be 

 carinate, this is not so in any of our species not even in that which 

 I recognize as hidentatum. 



The most curious character observed, and one which appears to 

 have escaped notice, is the structure of the tibial spurs in the male. 

 On the anterior tibia especially, the front spur is short and stout and 

 at the sides dentate or lobed, recalling somewhat the structure ob- 



