terminal segments of Halticella, c&c. 301 



rentibus, ibiqiie secundum lineam longitudinalem juxta- 

 positis et circa hypopygii basin segmentaque ventralia 

 brevia subnulla junctis " {loc.cit., p. 380). 



The general structure of the abdomen and its ap- 

 pendages in HaUicdla osmicida will be best explained by 

 exhibiting the different sectional parts under various 

 aspects. The importance of such illustrations had not 

 escaped the notice of Dr. Sichel, who states — " J'ai 

 essaye de dissequer toutes ces parties mais je n'y ai 

 reussi que tres-imparfaitement sur mes individus dese- 

 ches depuis longtemps et difficiles a ramollir et a manier" 

 (p. 354). 



In the figures which M. Andre has supplied of the 

 terminal segments in several species, the corresponding 

 parts whereof are not cited in the females (figs. 1 b, 

 2/, "Ig), the two spiraculiferous segments of his Halticelln 

 venusta ? , represented in 2/ and 2r/, obviously coincide 

 with the epipyginm (Sichel) and hypopygiiun. (Sichel) 

 respectively, — the terebral sheaths projecting beyond the 

 latter, — however difficult it may be to reconcile this with 

 his remarks thereon. It must also be assumed that his 

 figure Ih indicates the same relative parts in Chalcis 

 Gallica, Sichel, ? . As to his presumed ^Hrties (3 c, 4, and 5) 

 — the sex being defined in the first only, — they have been 

 credited in eacli instance with the full complement of two 

 pairs of spiracles ; and when speaking of these in 

 Phasganophora and Chalcis M. Andre observes — " Les 

 stigmates se retrouvent comme dans les femelles " 

 (p. 336) ; although, in so far as hitherto recorded, the 

 spiracles in this sex are limited to one pair on the 

 terminal or 7th segment (epipygium) ; * which I am 

 now enabled to corroborate as regards the males of 

 H. osmicida. 



In the accompanying details of the latter, Plate xii., 

 fig. 1 exhibits the dorsal segments of the abdomen in the 

 female, removed in one connected series, terminating 

 with the 6th {epipygium, Sichel), seen laterally. _ In 

 fig. 2 the contractecl ventral segments are retained 

 within the overlapping range of the former ; the apical 

 portion, in this instance, having been detached from 



* " Ejnj^yghim minimum, compresso-convexum, basi utrinqiie 

 spiraculo fere totum latus occiqmnte notatum.^ Hypopygium 

 itidem minutum, comprcsso-convexitvi, sed sjnractdo carets. 

 ^ tres." (Sichel in Phasganophora variegata, loc. cit., p. 380). 



