Genera and Sjyecles of Coleoptcra. 29 



In 1857 I brieriy churacteiized this genus, at the same time de- 

 scribing three species, all Asiatic. I do not see that I can add any- 

 thing really essential to those characters now. The genus is a very 

 natural one, and is allied to Krijthnis, but with an ovate-elongate or 

 almost subcylindrical prothorax ; elytra slightly contracted in the 

 middle, much more convex, and with a broad cmargination externally 

 near the shoulder. The palpi also are longer and more unequal. The 

 antennai vary in length, but are longest in the males, although 

 scarcely so long as the body. The pro- and mesostema are simple. 

 Professor Westwood has given an excellent figure of Pyrestes eximius 

 in the work above quoted (pi. 22. fig. 3). 



ERYTHRrs [Cerambycidae]. 

 White, Cat. Col. Ins. Brit. Mus. Longicornia, p. 142. 



Eryilirus conyruus. 



E. niger ; prothorace elytrisque cocciueis, illo nigro sex-maculato et medio 

 breviter carinato. 



Hah. Hong Kong. 



Slightly depressed, irregularly and closely punctured, black; pro- 

 thorax and elytra bright scarlet, the former nearly equal in length and 

 breadth, with six black spots, four on the disk and one on each side, 

 the middle with a short elevated line; scutellmn transverse; elytra 

 moderately long, an elevated carina running from each shoulder to near 

 the apex, which is rounded with its edges minutely serrated ; body 

 beneath entirely black, very closely and irregularly punctured ; legs 

 black, tarsi of the inteimediate pair longer than their tibice. Length 

 9 lines. 



From Saperda ? hicolor, Westw., this insect differs in being entirely 

 black beneath, in its six-spotted prothorax with a short elevated 

 line in its middle, in the more decidedly elevated and longitudinal 

 carina which occurs on each elytron, and in the general vitreous 

 sort of transparency which in certain lights and under a strong lens 

 ghstens over its surface, especially on the elevated lines of the pro- 

 thorax and elytra. It will serve to show the uncertainty of cha- 

 racters generally thought to be of generic value among the Longicorn 

 families that, notwithstanding the close affinity of these two Erythrij 

 amounting at the first glance almost to identity, the one, E. hicolor j 

 has the epistome very distinct, while in the other it is apparently 

 wanting. Erythrus Fortunei, White (the only other Erythrus having 

 the head black), is a narrower and smaller species, with a longer pro- 

 thorax and darker colour. 



F.2 



