NO. 2171. SYNOPSIS OF THE COCCINELLID LARVAE— BOVING. 625 



gether to such an extent, that the different regions can hardly be 

 discerned; there is no connecting lobe bej^ween submentum and cardo 

 and only a very faint boundary hne between submentum and the 

 big fleshy soft-skinned gula region (gu); this latter region is again 

 fused with the thick collar-shaped skin in front of pro thorax (fig. 1). 



At the base of mentum, close to the posterior margin of stipes, is 

 found a pair of large, sUghtly chitinized and indistinctly defined plates, 

 each with two setae; at the middle of submentum, adjoining cardo, 

 is found a similar, but smaller pair of chitinous plates, behind each of 

 which is a single seta. The labial palpus (Ip, fig. 8) is very short, 

 two-jointed, with a well chitinized ring-shaped basal joint, and with 

 a rounded apical joint, which is but shghtly chitinized; ligula (li, fig. 

 10), the fused laciniae labiales, is not well defined, subtriangular, 

 obtusely pointed. The mouth cavity (fig. 7) has in its floor a strongly 

 developed, chitinized bridge (hr, fig. 7), which limits hypopharynx 

 posteriorly and sharply defines the entrance to the pharynx (ph); 

 from this chitinization extend two pairs of chitinous rods, which form 

 the margins relatively of the hj^opharynx (hr, fig. 7), and the epi- 

 pharynx (er, figs. 4, 7); the hypopharyngeal rod has an interior 

 branch at the base; laterally in the corner of the mouth between the 

 upper and lower pair of rods, the chitinous bridge terminates in a 

 concave masticating surface, against which the convex basal part of 

 the mandible works. 



The thoracic segments conform in shape and size with the abdom- 

 inal segments more than is normally the case in coleopterous larvae 

 and it is not necessary to describe them separately. The tergal region 

 of each segment is ventrally defined by a longitudinal, cm-ved suture 

 (tp, figs. 1, 2), the tergo-pleural suture or lateral furrow, Dimmock ^ 

 ( = antipleural suture Boving ^) which is determined by two muscle 

 marks and by the upper ends of the vertical suture (vps, figs. 1, 2) 

 between the posterior pleural areas (3, 4, fig. 1) of one segment and the 

 adjacent anterior pleural areas (1, 2, figs. 1, 3) of the following seg- 

 ment. The outlying areas of tergum occupy a considerable portion 

 of the whole tergum. Dorsally they are limited by a line which can 

 be traced by a series of muscle marks ; the line starts at a muscle mark 

 just in front of the spiracle and runs vertically upwards to another 

 muscle mark immediately below the blood-exuding, repugnatorial 

 gland (hg, figs. 1,2) and hence around and beyond this gland; on the 

 thoracic segments, where there are no repugnatorial glands, the three 

 muscle marks are, nevertheless, easily located; the next determining 

 point is the terminus of a transverse dorsal suture (tds, figs. 1, 2), 



» Geo. Dimmock, Algunas Coccinellidae, etc., p. 295: en los segmentos abdomlnales de las larvas de 

 muchas especies entre la segunda y tercera hilera dorsal hay un canal longitudinal mis 6 menos definido 

 que ha sido llamada en este artioulo " canal lateral," usando el mismo nombre en cuanto & las ninfas. 



2 A. G. Boving, The Abdominal Structures, etc., p. 57. 



-Proc.N.M.vol.51— 16 40 



