chap, xviii.] MEDIAN DIVISION: BEETLES. 455 



694. A male, closely similar case (Fig. 140, II., ibid., 1877, xxr. 

 v .5l,Taf.i.fig.2. 



695. A male in which the pronotum was similarly divided, but 

 the division was not quite complete, de la Chavigxerie, Ann. 

 Soc. ent. Finance, 1846, Ser. 2, iv., Bull., p. xviii., PL II., fig. II. 



696. An almost identical specimen (male). Mocquerys, Coleop. 

 anorm., 1880, p. 140, fig. [Now in the Rouen Museum, where 

 I have examined it.] 



697. Another case ; extent of division not specified. Staxxius, Milll. 

 Arch. Anat. Phys., 1835, p. 304. 



698. Oryctes nasicornis £ (Lam.) : anterior part of pronotum 

 divided into two parts by a longitudinal suture : posterior part 

 of pronotum undivided. Head normal, ibid., PL V. fig. 7. 



699. Onitis bison (Lam.) : pronotum divided in the middle by a 

 longitudinal suture, the lateral pieces being raised up. ibid. 



700. Heterorhina nigritarsis (Lam.) : specimen in the Hope Col- 

 lection at Oxford having the pronotum completely divided into two 

 somewhat unequal halves, of which the left is the largest. The 

 posterior angle of each of the pieces does not occupy its normal 

 position, but lies internal to the outer border of the elytron. 

 Owing to this disposition the mesothorax is exposed for a short 

 distance on each side and for a considerable extent in the 

 centre. 



701. Attelabus curculionides (Rhyn.) : specimen of moderate size ; 

 head, elytra and legs normal. Structure of prothorax peculiar in that 

 the two lateral halves do not meet in the middle line, leaving 

 betwixt them a membranous space. The prothorax is shortened 

 and the head is pushed back into the thorax as far as the level 

 of the eyes. The edges of the plates of the prothorax are well 

 formed and properly finished. Scutellum present, but is not at 

 all concealed by the prothorax. Drechsel, C, Stettiner ent. Ztg., 

 1871, xxxii. p. 205. 



702. Chrysomela fucata (Phyt.) : Pronotum divided centrally into 

 two parts, each of which is triangular. The parts of the head and 

 scutellum which should be covered by the thoracic shield are 

 thus exposed. Krause, Stettiner ent, Ztg., 1871, xxxir. p. 137. 



703. Telephorus nigricans (Mai.) : the pronotum is divided into 

 two unequal halves. The left half is nearly twice as large as the 

 right, and projects beyond the middle line, covering a part of the 

 right side of the prothorax. The right portion is small and very 

 concave. Both of these two parts of the pronotum are everted 

 at their edges to form a definite margin. The margins are con- 

 tinued all round each piece, and thus two margins are adjacent 

 in the contiguous parts of the plates. This specimen was kindly 

 lent to me by M. H. Gadeau de Kerville. 



704. Carabus scheidleri: thorax dorsally covered by two com- 

 pletely separate and symmetrical plates, whose inner edges are 

 beset with yellow hairs [as the anterior and posterior margins 



