456 MERISTIC VARIATION. [part i. 



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

 Berl. ent. Ztschr., 1873, xvn. p. 430, fig. 



705. Carabus lotharingus : thoracic shield divided in centre to 

 form two triangular pieces which only unite at a single point. 

 The head is drawn back into the thorax. Duponchel, Ann. Soc. 

 ent. France, 1841, S. 1, X., Bull, p. XX., PL 



706. Lixus angustatus (Rhyn.): thoracic shield partially divided, 

 present a deep emargination both before and behind [description 

 not quite clear]. Doue, Ann. Soc. ent, France, 1851, ix. Bull., 



p. LXXXII. 



III. Metasternal plates. 



~07. Rhizotrogus marginipes $ (Lam.) having the abdomen de- 

 formed in a svmmetrical manner. Looked at from the ventral 

 surface the metasternal plates are seen to be divided in the middle 

 line by a deep depression so that the abdomen consists superficially 

 of two lobes ; 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. 220, fig. 



IV. Pygidium. 



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

 Kraatz, G., Deut. ent. Ztschr., 1880, p. 342, PL II., figs. 4 and 

 4 a; and ibid., 1889, p. 222, PL I., fig. 19. 



■j-qq A case of "double proboscis 1 ' is recorded in Sphinx ligustri. The specimen 

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

 had not united to form the single proboscis, but were divaricated. Kraatz, Deut. 

 nit. Ztschr., 1880, xxiv., p. 345, rig. 



Miscellaneous cases of doubtful nature. 



T 1 0. Ascidians. Prof. W. A. Herdman tells me that he has several 

 times met with Ascidians having a supplementary lateral atriopore. 

 He regards this as a retention of a larval character, since in the young 

 there are two atriopores which in normal individuals afterwards unite 

 dorsally. 



711, Limulus polyphemus : large specimen found at Fort Macon, N. 

 Carolina, having a forked caudal spine (Fig. 143). This variation is 



Fig. 143. Limulus polyphemus No. 711, having forked caudal spine. 



(After Packard.) 



