154 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



The maxillae, labium, mentum and submentum 1 are inserted in 

 the deeply curved hypostoma. 



The maxillae (figs. 8-9), are large. The cardo is separated from 

 the lower part of the stipes by a transverse separating line which 

 can be seen by a careful examination. The cardo is without any 

 setae but terminates basally in a more strongly chitinized part. 

 The stipes is large and bears one strong and one small seta. The 

 palpiger is free and bears a long seta. It is fused with the sub- 

 galea and the maxillary lobes : the flat lacinia and the more joint-like 

 galea. 2 The lacinia on the dorsal side is furnished with long stiff 

 spines and soft hairs. The maxillary palpus is two-jointed, the 

 basal joint having a fine transverse line and four strong spines on 

 the dorsal side, and the terminal joint several small sensory proc- 

 esses. 



Along the margin towards the labium the palpiger has a rod-like 

 chitinization, which at the base is connected with a similar struc- 

 ture along the margin of the hypopharynx. From the connecting 

 point starts first a staff -like thickening along the stipes, second, a 

 similar thickening around the lateral border of the- epipharynx 

 and third, a free, rod-like prolongation to the carinated frontal 

 suture. 



The labium is somewhat broader than long with two pairs of 

 sensory punctures; the labial stipites form an incomplete chitinous 

 basal ring. The labial palpi have a broad short basal joint, an 

 elongated, narrow second joint with a single seta and a minute 

 apical joint also bearing a seta. The spinneret (the fused labial 

 lobes) protrudes beyond the palpi and is placed ventrally, well 

 within the anterior margin of the labium. The mentum (fig. 9), 

 is large and unchitinized, at the base separated from a short sub- 

 mentum by a bow-shaped transverse line. It has a single pair of 

 sensory punctures. The submentum is also unchitinized. On 

 the dorsal side of the labium towards the mouth cavity, the hypo- 

 pharynx is provided with a series of long branched hairs. Further 

 down is found a chitinized plate with the rudimentary third pair 

 of maxillae, the socalled maxillulae (fig. 8). They are provided 

 with short spines and correspond exactly to homologous elements 

 described in the beetle larvae by Carpenter and Mabel MacDowell, 

 (1. c. p. 375). 



The body tubercles (figs. 2-3) are only discernible by their 

 setae, which are themselves rather small. The arrangement 



1 Forbes, (I.e. p. 96), states, "The lower lip in caterpillars is formed of 

 the maxillae as well as the labium," but this is a confusion of terms, as the 

 term labium and lower lip hitherto have been regarded as synonyms. 



- This may be more correctly interpreted as the digitus laciniac figured 

 by Comstock in a Coleopterous maxilla, fig. 605, in his Manual, 1895. If 

 so, the galea is absent. 



