Mfinoir$ of the Indi-in MuArum. 



[Vol. VII, 



'nui" twi> parts of the rlyp*'!!-* mny l»o rtTogiiiHiNl, iminoly, a «loi>al (r«« imrt nnd n ventral 

 purt cliwcly oppomnl to the iui'iu>)riine uiiitini; it to tin- Inltrtim. The |M.st«Tior part of the 

 fr<H' Hurfnre of the iiypeu> is -unk in the anterior margin of the fmnM the two platen U-iiig, 

 however, H|.pnnit»'<l hy a well n»arke«l suture; an<l the |)o.Hterior annle.-* are unitwl with the 

 ndjoininf; jxirtions of the fron^ to forn\ a pair of Huiall tiil»ercle,H. Thesi- tulMTi Irs are those 

 to whiih the iiBme " outer tul>er»les " was niv€M> in iiiv previous paiuT, a name which nuiy 

 convenientiv \*c retaine*! for them. 





K uwprt ). 



■ ms (lUtf*). \ •iiri 

 . . „ 11 )iloli. 



4. /'aMniai alkuM. l^irchonin. MiMlian wcliun ul \t\t\K-t ami anlorinr |iar(* of hratl. 



• I )\rn<\. Til"' oiilliiw «il 111- [.Into. „t thf upper 

 i>y rontiiiuouii, antl tliiMr ol tlir lowpr nurfacv by 



' .kiitriiiiii. 

 ol .lypou*. 



Ir. Iron.. 



Ir f. — (rontal riilup. 



/.!.«. (roiitot-iTliciil Kiituip. 



i.f. iiiniT tiilwrclp. 



Ihr. -Ulirum. 



/br.m. -'nu'inlirnrip In-twrrn labruni ami clypf'U*. 



n.l. — oiltrr tulMTi-lc. 



«.»r.--tu|iranrl>ital ritlKP. 



r./,- -Ventral tuljcrrlr. 



Having ii|entitie<l the clypeus in forms such ns Oih-nidrn suhnrtin^niis. in wlii<l, no doiiht 

 with regard t<> it r.m aii-f. the fate uf the fn-o -urfa< r uf tlii- idatr in otlicr f<>iiii> ran reailily 

 be f»»IUiwe<l. 



In sp«Hi«'s l»fli>iigini; t.« tUc -ul'taniiiy I'-tMnlat ant iimai- (">i tin-, pajx-r) the « lypous is 

 ahvnv.H separate<l from the frons l>y a definite suture, though this varies greatly in thape and 

 in some spe«'ie.s the inner tuben-les are .situate*! so sk» to interfere .somewhat with its continuity. 

 In the Proi-ulinae, in a few .species of Passalinae. anri perhaps also in the .\ulacocyclinae. the 

 clypeus has the name structure as in the Psou<lacantliinae. !iut the suture is absent. In all 

 other >|K»cies the free surface of the clypeu.' is re<hut'd to (at mo^t) a narrow transverse band, 

 «itur-te«l Iwlow the anterior margin t>f the head, and tcrminatetl laterally by a pair of .small 

 downwartlly <lirect«l tuberclej*. the " ventral tubercles " of my previous paper (19140. text 

 fig. I. p. 181). These " ventral tid»ercles" really the anterior angles of the reduce<l fn*e 

 surface of theclvpeus — are extrenu-ly per-istcnt, and their presence or abs4M»ce almost al way- 

 enables one to determine whether the anterior margin of the head really coneealn this surfai-e 

 of the clrpeus or includes it. T«» see then) clearly, however, it is often neces^sary to remove 

 the labrum. The outer tubercles are nornutUy situated immnliateiy alnive or a little to the 

 out*r .^ide of them ; but in some forms these tul>««rcles tend to come nearer together and may 



