Vol. XXvil ENTOMOLOGICAL NEWS. 



443 



Antsoplettra comes? .Needham. Ent. News, xxii, p. 149, pi, v, figs. 

 1-3. 1911. 

 F.uphara dufarr Ha«cn. C R. Soc. Ent Belg., xxiii, p. Ixvi, i88a 



Baya<len indica. N'eedham. Ent News, xxii. p. 150, pi. v, figs. 

 4-7. 

 Anisopleura comes? Hagen. C. R. Soc Ent. Belg., xxii, p. Ixvi, i88o. 



Cora chirripa. Calvert. Ent. News. xxii. p. 49, pis., ii. iii, 1911. 

 It is not stated whether these lateral pills are kept in move- 

 ment during life or not. 



Stigmata (Spiracles). 



Dcwitz ( 1890, pp. 504, 526), on immersing Agrionid nymphs 

 in diluted alcohol, or on raising or lowering the temperature 

 of the water in which they were contained, saw air escape 

 from a thoracic stigma of one side of the body. As the older 

 nymphs crawled up to the surface of water, which had been 

 boiled, and exposed their dorsal thoracic surface, he inferred 

 that they inspired atmospheric air. 



By >-' ' i; the early stages of Odonata to the action of 



olco-ciL to partial vactia, Portier (1911, pp. 216-7) con- 

 cluded that in Caloptcryx, as in Aeschna and Libelluta, the 

 tracheal system is not closed to air, although not permeable 

 to water, fats or their solvents. In the younger larvae, one or 

 the other of a (xiir of ventral spiracles at the junction of thorax 

 and abdomen allows passage to air, while in the older nymplis 

 these ventral stigmata are lacking, but one or other of a pair 

 of anterior dorsal thoracic [mesothoracic] spiracles transmits 

 air from within or from without. 



Bcrvoets (1913. pp. 25-26) also employed the vacuum meth- 

 od. In larvae of Agrion 3 mm.* long he was unable to per- 

 ceive any discharge of gas until he cut the caudal gills; in 

 larvae 5 mm.* in length and longer, bubbles of gas issued from 

 the dorsal stigmata between the pro- and meso-thorax, always 

 more abundantly from one side than from the other.t 



•These dimensions were exclusive of the caudal appendages. 



tBervoets has used (pp. 27, ag) the term Isoptera for the Agrioni- 

 dae, evidently in contrast with Anisoptera. Isoptera is, of course, 

 preoccupied as an ordinal name for the Termites. 



