€06 NORTH AMERICAN SCOLYTID BEETLES— ETCHHOFF. 



tbat tlie three species Hylesiiius opaculus, sericeus, and trifolii are more 

 properly placed in Rylastes or Bylun/ops than in Hylesinm, 



[A typical specimen of Hylasfes rufi2)es sent by Eicliliofl" proves to be 

 identical with Hylesinus opm-ulus, Le Conte, the former name having 

 priority.] 



HYLURGUS SUBCOSTULATUS, Mannerheim. 



Hylurgus suhcostnlatHS, Mannerheim, is undoubtedly synonymous with 

 Eylastes alternans, Cbapuis, the former name being- the older one. 



HYLASTES PORCULUS, Erichson, and others. 



When Erichson, in 1836,' established the new hylesiuid genus Eylastes, 

 he described, in connection with a large number of European species, 

 but a single species from Xorth America under the name of H. por- 

 ei(U(fi, the typical specimen having been sent him by Zimniermann, from 

 Pennsylvania. More than half a century lias now elapsed, but the 

 Korth American and European entomologists have not yet agieed 

 about Erichson\s species. It has been asserted by Le Conte that 

 RyJuryus scahripennis, Zimmermann (described in 1868), is ''certainly" 

 identical with, par cnhis, Erichson, but I have to dissent from this opin- 

 ion for the following reasons: 



Erichson says in his description : "Thorax J('»,sr rnditer(iiie puncta- 

 tus; elytra liuearia, dorso siihdepressa, punctis yrossis striata, interstitiis 

 anfjustis, gramilato-riigosis, iuterioribus devath, carinatis^ sutura vero 

 depressa:' Xot one of these characters is to be seen in H. scahripennis, 

 but Just the opposite: Disk of elytra strongly convex, tine punctures 

 at the bottom of the narrow elytral strife,, coarsely transversely-rugose 

 interstices, which are wider than in the allied species. H. cavernosvs, 

 Zimmermann, on the contrary, agrees word for word with Erichson's 

 description of IT. jio re u I us— densely and coarsely punctate thorax, nar- 

 row elytra with coarsely punctate stria- and narrow grannlately punc- 

 tate interstices. The first stria near the suture is much wider and 

 more deeply excavated than the following, and this causes the disk of 

 the elytra to be perceptibly deplanated, with the suture depressed and 

 tlie following interstices somewhat carinately-convex. It appears to be 

 beyond question that H. porculus, Erichson, is identical with //. cavcr- 

 nosus, Zimmermann, but not with II. scahripennis, Zimmermann. 



//. granosKs, Chapuis, is also identical with II. poreiiliis, Erichson— a 

 fact ascertained by me from the three specimens in my collection, which 

 iuv tlie types of Chapuis. One of these I herewith send you. 



Further, II. salehrosus, Eichlioff,- is unquestionably identical with 

 //. scahripennis. Zimmermann, the former name having priority. 



Finally, H. scohinosits, Eichhoflf, is very closely allied to H. salehrosus. 

 However, the form of the thorax, with its nearly straight sides which 



' Wiegniaim's Arcbiv, I, p. 49. 

 "Berl. Ent. Zt-itsclir., 18G8, p. 146. 



