Insects 173 



the group containing the common June-bug, and the May-beetle 

 or cockchafer of Europe, as well as the sacred Scarabaeus of the 

 ancient Egyptians. The fat curved larvae may often be found 

 in the ground, injuring the roots of plants. The Colorado species 

 are quite numerous, some of them large and conspicuous. Thus 

 the common Euphoria inda, found on thistles, has the elytra 

 warm reddish, speckled with black. According to Casey, the true 

 or typical inda of Linnaeus comes only as far west as Nebraska, 

 and he proposed to separate our insect under the name E. rufo- 

 brunnea. The large Polyphylla decemlineata of Say, which has 

 been taken in Boulder (Elizabeth Benson), has seven cream 

 colored stripes down the back. Between the stripes, the surface 

 appears greenish, but this is an optical illusion, due to minute 

 yellow scales on a black ground. I have found the larva of this 

 beetle at White Rocks near Boulder. A curious rather narrow 

 black scarabaeid, Cremastocheilus k.nochi, is found only in the 

 nests of ants, being one of the insects called myrmecophiles, or 

 ant-lovers. 



The Cerambycidae or longicorn beetles, are usually known 

 by the very long antennae. The larvae are most frequently 

 found boring in trees, but some infest herbaceous plants, and 

 there is a curious genus on cacti. We have a very large species, 

 not uncommon, which is over two inches long, the elytra with 

 pale marbling on a dark ground, and the thorax spined at the 

 sides. This is Ergates spiculatus neomexicanus of Casey. Almost 

 simultaneously with Casey's publication, (1890) I named this 

 beetle marmoratus, and in discussing the matter later, Col. Casey 

 was not able to say which was published first. However, there 

 seems to be good evidence that the name given by Casey has 

 priority. Cyllene robiniae is the locust borer, only recently 

 introduced into Colorado from the eastern states. The larvae 

 are very destructive to the locust tree (Robinia), as may be seen 

 on the University of Colorado campus. The beetle is about 

 three-quarters of an inch long, with transverse curved and angular 

 canary -yellow bands on a black ground. Bright red longicorns 

 found on milkweed belong to the genus Tetraopes. Dark colored 

 species with finely crinkled elytra and excessively long antennae 

 are Monohammus. Rather small dark purple forms belong to 

 Callidium. Altogether the longicorns form a large and very 



