Vol. XXVlii| ENTOMOLOGICAL NEWS. 477 



correlation of colors with habits both imaginal and larval (pp. 248, 

 256), including change of color in the larva induced by color changes 

 in its environment; in chapter XIV, alterations is classification where- 

 by the family Lestidae is separated on entirely new characters, the 

 genus Epioplilclna of Japan being included therein, and the elevation 

 of many of de Selys' legions to the rank of subfamilies; the discus- 

 sion of zoogeographical distribution tinder the headings of the palaeo-, 

 ento- and ectogenic faunae (chap, xv); a new phylogenetic diagram 

 (p. 319) : an estimate of the flight-speed of dragonflies which in 

 .htstrt>plitcl>!(i is placed at "nearly sixty miles per hour" (p. 323)- 



Admirable features are the numerous original illustrations, sonic 

 of them due to Mrs. Tillyard, the great majority of all the figures 

 in the book having been made by the author from new material, as 

 those of many wings, larvae, parts of the nervous system, sense or- 

 gans and many viscera; the elaborate tables of equivalents in nomen- 

 clatures of wing-veins and -areas (pp. 40-43), of the muscles of the 

 entire body of the imago (pp. 206-209) and of the census of the 

 Odonata of the world (p. 300) in which the total number of species 

 is placed at ..2457 in 429 genera. 



So excellent is this book that the reviewer wishes for it a wide and 

 an intensive use and he would fail in his duty if he did not point out 

 some details which seem to him to require correction, that it may 

 be of the greatest value. The first sentence of chapter I implies 

 that Linnaeus recognized a family LibcUulidac, but Linnaeus' cate- 

 gories included no families and no group names terminating in idae; 

 these are post-Linnean. Baron Edmond de Selys-I.ongchamps died 

 December 11, 1900, not in 1890 (p. 2). 



In the table on p. 92, the sign for the appendix dorsalis in the col- 

 umn "Imagines Zygoptera" should be replaced by a X sign for 

 "rudimentary" (cf. Hagen & Calvert, Bull. Mus. Comp. Zool, xxxix, 

 pi. I, figs. 18 and i8r and explanation thereof, p. 119, under ?) The 

 statement that "In Zygopterid larvae the rectum is undivided" (p. 101, 

 footnote) will require some modification, as work by Mr. Mitchell 

 Carroll, not yet published, shows. The problem of "the missing ab- 

 dominal ganglion," stated (p. 132) as solved in Pctalura, had been 

 solved in 1903 in the note cited as No. 28 of the bibliography on puur 



364- 



Those interested in the physiology of the nervous system (pp. 135- 



136) will find additional data in the work of Babak and Foustka (1907) 

 and of Matula (1911), as well as in Babak's summary in Winter - 

 stein's great IlamUmch dcr rcrt/I. I'Iiysit>lo</ic (1912-13). The expres- 

 sion "Closed System" applied to the dorsal vessel hardly seems ap- 

 propriate, since the latter is truly said to open "into the haemocoele" 

 (p. 157). Contributions to knowledge of spermatogenesis (p. 213) 

 have been made since I'utschli by Lefevre and McGill (1908, 1912) 



