Life-history of Dasyhelea obscura, Winnertz. 583 



superposing one above the otlier, wbilc the third pair (/. 3) 

 is curved and lies beneath the wiugs. 



Th"e respiratory tubes or horns (PI. XX. fig. 15, p. ^., and 

 fig. 21) shovr numerous scale-like triangular plates and bear 

 from 21 to 22 respiratory papillse. The abdominal segments 

 are divided, each by a row of dark strongly chitintzed hooks 

 and plates, into two portions, anterior and posterior (PI. XX. 

 fig. 19). The hooks grow in size near the lateral sides of 

 the segments, and become flattened and almost scale-like 

 near the dorsal and ventral median lines. Each hook or 

 scale bears a sensory hair arising from a small circular pit 

 (PI. XX. figs. 17 & 18). In front of the row of hooks the 

 dorsal side of each abdominal segment shows 2 more or less 

 chitinized spots and, more laterally, 2 short sensory papillae. 



The whole surface of the abdominal segments is covered 

 with short booklets or scale-like projections. 



The last abdominal segment shows ventrally a longitudinal 

 split and dorsally four pairs of strongly chitinized papilke, 

 tw^o of which are provided with sensory hairs (PI. XX. fig. 20). 



The pupal stage is of a very short duration — six or seven 

 days only. 



V. Larv,^ of other Species op Dasyuelea, recorded by 

 VARIOUS Authors. 



The genus Dasyhelea is composed of several species, some 

 of which are difTinult to identify as there still remains 

 some confusion about their nomenclature. 



Mr. F. W. Edwards, of the British Museum, has kindly 

 supplied me with the following list and synonymy of a few 

 species of Dasyhelea, the early stages of which have been 

 recorded and in some cases described :^- 



1. Dasyhelea favifrons, Guerin, 1833. 



2. Dasyhelea dufouri, Laboulbeue, 1869. 



3. Dasyhelea hippocasiani, Mik, 1888. 



4. Dasyhelea obscura, "Winnertz, 1852. 



J), homocera, Kiefler, 1919. 



5. Dasyhelea obscura, var. goetghebueri, KiefTer. 



D. versicolor, Goetghebuer, 1914 ami 1920. 



D. goetghebueri, Kieffer, 1919. 



]J. brevitihialis, Goetghebuer, 1919. 



6. D. versicolor, Winnertz, 1852. 



D. sensualis, Kieffer, 1919. 



D. bilitieata, Goetghebuer, 1920. 



7. Dasyhelea halophila, Kieffer, 1911. 



8. Dasyhelea coarctata, Kieffer, 1913, 1914. 



9. Dasyhelea dijAosis, Kieffer, 1913, 1914. 

 10. Dasyhelea longipalpis, Kieffer, 1913. 



