To The West American Scientist. 



b. Lateral plates not keeled ; head not crested. 



Parahybae. 

 bb. Lateral plates all keeled ; occipital with three crests. 



Lophophanes. 

 {aa. ) Ventral surface entirely granular. 



(c.) Eye 6-6| in, the head to end of occipital plate; head 

 arched above; opercle and interopercle with spiny margins; lateral 

 plates keeled; surface of all the plates entirely covered with spf- 

 niferous ridges. t Agassizii. 



(cc) Eye small, 10 or more in the head; head flattish above; 

 lateral plates not keeled. Aspera. 



The specimens belong to the Museum of Comparative 

 Zoology at Cambridge, Mass., and the numbers given refer to 

 the catalogue of the Museum. 



C. H. & R. S. Eigenmann. 



NOTES ON THE FLORA OF CUSTER CO UNI Y, 



COLORADO.— III. 



Townsendia sericea hook. — Common on the prarie. one 

 of the earliest flowers of the year. It is also recorded from Fre- 

 mont Co., and Miss M. Sidford has collected it at Colorado 

 Springs, El Paso Co. 



Solidago missouriensis nutt. — Abundant at about 8,400 

 feet. The larvce of the beetle (Trirhabda flavolineatus) feed 

 upon it. These larvce, which have not previously been de- 

 scribed, are about twelve millimetres long, moderately stout, 

 with all the segments approximately of equal size. The head is 

 very dark brown and shiny. The body is a dark metallic 

 greenish blue, pale yellowish green beneath, sparsely hairy with 

 short hairs, and having a row of raised tubercles on each side, 

 one on each segment. The legs are black, pale at their bases. 



Aster Lcevis, L., var simplex. — This answers to the de- 

 scription of lcevis, except that the flower head has only 17 to 18 

 rays. It is locally abundant at about 8,400 feet, ^cidium 

 compositarum, mart, is found upon its leaves. 



Erigeron radicatus, Hook — Common on the prairie, and 

 flowers early in the year. 



Antennaria disica, Gcertn— Very abundant in open ground, 

 and very variable. The ordinary form has white flowers, bujt a 

 var. rosea is not unfrequent, in which the flower heads appear of 

 a beautiful pink color. 



Gymnolomia multiflora, (Nutt.) — Abundant; the homop- 

 terous insect, Publilia modesta uhler, occurred upon it in great 

 abundance just in front of my house. I also found G. multiflora 



