NOIITII AMERICAN C()I,KOI>TKll,\. 



7:5 



thonix iiuioh loiiijor thiiii liroad, n'ulo* tuiurly Mlrisiflit, mid Hli^'htly ('Diivorging 

 posteriorly. Liirft two joints of iuitcMiniic iiiudivlosud. Li^iisjth 2.4 — ;t.O iniii. 



N. Y^, Fin., 0.1. I'lutc TV, Fij:. 5. 



Miy bo (listiiio:iiishc(l by its p'ncrally l!ir<ro si/o and sbininfjr siirftict>, as 

 W'll Ity its liirlit culor. 



'i'lu! protlinra.x of this .spwii-.s is usually sliiihtly olouLratcd ; s|)(>ciinoi»s, 

 liowcvor, arc »i\i'i\ seoii in which it is aliuusl exactly <juatlratc ; to con- 

 sider if, therefore, ius •generally suh-<|uadrate. as has been ilonc in the 

 tables would si^eiii to be a.s jrood a course out of the dileniiiia ius i.s avail- 

 able, when we take the structure ol' this part as the basis of classification, 

 I am unable to state whether this variability of thoracic form is due to 

 Hex or to accidental circumstances. 



pro- 



ti. H. XilKB 11. sp. — Form iiKjdpraioly rolnisl, d('i)rossed ; sides piinillel; pu- 

 bescence very short, reciunbent, setiforin nnd aiTanj;ed in very closely approxi- 

 mate rows upon the elytra. Ifead suli-cniailrato ; sides nearly parallel heliind. 

 rai)idly converi^eiil liefore the liases of the antennae ; snrfac(^ nearly (hit and finely 

 riii;iilose; eyes very small : geiiae acute. Antennae somewhat shorter than head 

 and prothorax together; first three joints equal in length; tirat slightly more 

 rohust; sixth an<l eighth smallest, equal in thickness, and niueli smaller than the 

 seventh; joints of cliih hut slightly thicker than the lirsl, equal in width, last 

 joint nearly glolmlar. Prothorax somewhat longer than wide ; nearly Hat in the 

 middle, inclined at the sides, wider than hejid aiilerlorly ; side.s notahly hisin- 

 uate. portion between the siiiuations strongly arcuate, ami minutely jrannlate; 

 anterior teeth strongly developed, posterior much smaller aii?i ilislinct ; |iosterior 

 margin in the form of a very brdad triangle; surface lindy and transversely riigu- 

 lose. Elytra equal in width to prothorax, togther evenly roundeil behind, some- 

 what more than twice as long us wide, and two and one-half times as long as the 

 jinpiiotum ; sides parallel and very slightly arcuate; borders very narrow and dis- 

 tinct, not be<!oming narrower jiosleriorly ; surface more convex posteriorly; mi- 

 nutely, and somewhat obscurely punctato-striate ; sciilellum excessively short and 

 transver*e. Legs very short, femora robust, tibiae I'urvate; first two joints of tarsi 

 robust, remainder sleinler, last joint much elongated. Color throughout rufo-Ies- 

 taceoiis. Ijeiigth 2.9 — ;'...) mm. 



Arizona ( Morrison ). 



Keceived too late for fiiiiirinjj;-. The species .seems, however, to be very 

 distinct. 



The species considered thus far are ipiite elonirated ; the three follow- 

 inir are much shorter, althoudi nearlv of the same width. 



7. S. adveiltt (Waltl.) — Hather light brownish cas':'ncous, convex ; protho- 

 rax qua<lrat.c, broader than long ; sides arcuate ; anterior angii? with minute blunt 

 teeth, which are followed immediately by slight emarginations. Surface lightly 

 punctured, and sparingly piibes<'ent ; pubescence rather long. Length I.!) mm. 



Cosmopolitan. I'late IV. Fiji', (i. 



This species is so common as to requive ne further comment. 



TRANS. AMKH. KNT. SOP. XI. 



(19) 



PKBRUAIIV, 1884. 



