30 



syslems from each other. The hihriim, Ihe Tree [)arl ol' which is ralher sliorl and 

 obtusely pointed, becomes broader and broader ))nck\vards (PI. I, fig. 8 a). 'Ihe 

 anterior portion is provided witli a pair of exterior delicate ridges (fig. 8 a, c) and 

 also with a pair of inner strong ones, more and more diverging behind and at 

 least passing over in the lateral margin of the labrum proper, which is probably 

 fused with the inner side of the maxillae (fig. 8 a, a, m). The hindmost portion ol 

 the labrum is laterally covered by the overlapping inner portions of the maxillae. 

 The upper surface of these are naturally divided into two areas, a hinder thinly- 

 skinned one, and a foremost one thicker-skinned. The limitation between the two 

 is a fine line, continued over the labrum, to which the delicate membrane between 

 the maxillae and the antennae is probably fastened (fig. 8 a, /). This hindmost 

 portion is provided with a system of ridges, which as seen in the figure, are most 

 complicated along the posterior margin. Croneberg has mentioned the inner i)or- 

 lion of this system and writes (38. p. 29, taf. XV, fig. 7) that the base of the rostrum 

 "besteht aus zwei dreieckigen, hinten und oben zusammenstossenden Platten, denen 

 hinten noch zwei kurze Forlsätze angefügt sind"; these "kurze Fortsätze" (fig. 8 a, /i) 

 are only the broad hindmost margin of the overlapping portion of the maxillae, 

 which behind seems to be connected with the corresponding one of the other side. 

 Where the sides of the labrum meet the posterior margin of the maxillae at a 

 deep notch (lig. 8 a, ;i) a strong balk arises, which is directed through the inner 

 cavity of the maxillae and projects with its tip into the articulate-cavity of the 

 trochanter (fig. 8 a, ;), The manducatory part is fairly well developed and bears 

 a few hairs. A broad and long lamina maxillaris, with the outer margin serrated 

 and probably homologous with the lamina superior of other forms, is present 

 (cf. pi. Ill, figs. 8f-g, Is). 



The anterior marginal tissure of Ch. nodosiis Schrank is almost circular, opens 

 outwards and seems to include a depressed area with a body within. The corres- 

 ponding fissure of Ch. Murraiii Poc. is narrow and almost semicircular with the 

 concavity facing outwards; the thinly-skinned area, which is partly included by 

 this fissure, contains in the middle a round body. The anterior fissure of Cli. 

 lampropsalis L. K. sp. af. is narrow, almost circular and apparently including a deep 

 cavity. The median organ of Cti. Murrai/i Poc. consists of an almost circular 

 narrow fissure only open in front, where another shorter fissure appears; the area, 

 included by these, is depressed and similar to an articulate-cavity. The corres- 

 ponding organ of Ch. lampropsalis L. K. sp. af. consists of a narrow, almost circular 

 fissure, only leaving the front open; in the bottom of the deep cavity within 

 another semi-circular fissure (?) is found. Dorsally near the exterior margin just 

 behind the insertion of the trochanter an organ, consisting of four obli([uely placed 

 tissures, is found (fig. 8 a, /■■'); on the exterior side I have found three almost 

 longitudinal fissures, one fairly long and two very short in Ch. lampropsalis L. K. 

 s]). af., probably identical with those, described by Hansen (49. p. 206). 



Croneberg has both in 1880 (38. pp. 290-292, taf. XV, figs. 7-9) and in 1889 



