242 THE CANADIAN ENTOMOLOGIST. 



Prothorax two-thirds as deep as the vertex; lateral carin?e distinct, 

 following the curve of the eye ; behind each carina a row of seven 

 pustules ; median carina faint, a puncture on each side of it about the 

 middle of the prothorax ; posterior margin quite deeply concave ; colour 

 deep reddish brown. 



Legs yellow lineated with brown ; tarsal claws black ; spur triangular, 

 finely toothed. Scutellum a little more than tv>'ice as deep as the 

 prothorax ; triangular, sides strongly arcuate, terminating in a rather sharp 

 point ; two pustules on each side near the middle of the lateral margin ; 

 median carina distinct, lateral caringe rather faint, divergent ; colour 

 polished black with yellowish tip. 



Elytra extending one-third of their length beyond the abdomen ; 

 veins brown, membrane slightly smoky. 



Abdomen black, except the dorsum of the first two segments, which 

 is yellowish ; along the lateral margins of the dorsum of each segment is 

 a transverse row of four pustules. 



Genitalia: pygofers tapering to a blunt point, dark reddish brown ; 

 plates about one third as long as the pygofers, only a narrow edge show- 

 ing, light brown in colour ; ovipositor and anal tube dark honey-yellow. 



Length, including elytra, 3.5 mm. 



Described from a female taken by Professor J. Chester Bradley at 

 Felton^ Santa Cruz Mts., California, May 17, 1907. Type in the 

 collection of Cornell University, 



This species may be readily told from A. albosignata by the deeper 

 vertex, the different coloration, and by the presence of four instead 

 of two pustules on each side of the abdominal segments. 



THE NORTH AMERICAN .ESHNID DRAGON-FLIES. 



At the present time, when the air is full of nomenclatural discussion, 

 when there are many entomologists who are devoting themselves almost 

 exclusively to naming and classifying insects from dried skins, "systemat- 

 istb'"' they are called, and we often seek in vain for the system, it is as 

 refreshing as a woodland brook to a tired traveller to read a monograph 

 of the nature of Dr. Walker's "North American Dragon-flies of the genus 

 x-Eshna'"^ Here we have a systematic study of a group in which the 



*University of Toronto Studies, Biological Series, No. 11, VIII, 213 pp., 28 

 plates (6 coloured). Publ. by the Librarian, University of Toronto Library, 

 1912. $2.00. 

 August, 1912. 



