456 MKl;l>TK' VARIATION. [PART I. 



normally are]. The rest of the animal was normal. KRAATZ, G., 



/;. .'/. ent. Ztechr., Is7:{. xvn. p. 430, fig. 

 0"). Carabus lotharingus : thoracic shield divided in centre to 



form t\v-i triangular pieces which only unite at a single point. 



Th- head is drawn back into the thorax. DUPONCHEL, Ann. Soc. 



ent. France, 1*41. S. 1, x. Bull., p. xx., PI. 

 <>ii. Lixus angustatus (Rhyn.): thoracic shield partially divided, 



pn-s, ni a deep final filiation both before and behind [description 



ii"t ijiiitf clear]. DOTE, Ann. tioc. ent. France, 1851, ix. Bull., 



p. i.xxxn. 



III. Ml'TASTI.lLNAL PLATES. 



Rhizotrogus marginipes $ (Lam.) having the abdomen de- 



in a symmetrical manner. Looked at from the ventral 

 surl'ace the met asternal plates are seen to be divided in the middle 

 line by a deep depression so that the abdomen consists superficially 

 of two luhe^ : these two lobes are united together in the last 

 segment in which the metasternal plate is undivided. The two 

 lobes are of equal size and the longitudinal depression which 

 divides them is shewn in the figure to be regularly and sym- 

 metrically formed. The animal is otherwise normal. [No dis- 

 section was made.] BAUDI, L. V., Bull. Soc. Ent. Ital., 1877, ix., 

 p. -I*}, fig. 



IV. l'Y<;mir.M. 



70s. Melolontha vulgaris (Lam.): pygidium bifid, two cases. 

 'KRAATZ, (I., lk>,it. ent. /?*</,,:, isso, p. ' rUi', PI. II., figs. 4 and 

 4a; and ibid., L889, p. -2-2-2, PI. I., fig. 19. 



709. ^ case ^ "double proboscis" is recorded in Sphinx ligustri. The specimen 



was a pupa, and through the juijial skin it could be seen that the two mandibles 

 had uot unitril to form the single proboscis, but were divaricated. KHAATZ, l>eut. 

 int. /.t.^-lir., issQ, xxiv., p. MI."., li-. 



cases <>f <lni<l>t//il nature. 



7K). Ascidians. Pn.f. W. A. llcrdman tells me that he has several 

 times met with Asridiaiis having a supplementary lateral atriopore. 

 lie retail Is this as a retention of a larval character, since in the young 

 then- are t u o at riopores which in normal individuals afterwards unite 

 dorsally. 



711 Limulus polyphemus : lai ^e .specimen found at Fort Macon, N. 

 havin<r a forked caudal spine ( Fi^. 14.'5). This variation is 



Ft'.. 113. Limulus polyphemus No. 711. having forked caudal spine. 



PACKARD.) 



