244 ENTOMOLOGICAL NEWS. [June, '17 



andromache, similar to incicrurmn; flammeum, tooth well de- 

 veloped but distinctly shorter than claw, both tooth and tip of 

 claw slenderer than in the preceding two species, the tooth 

 not so divergent, the included angle more acute ; dorsale, simi- 

 lar to flammeum : demaranim, short as in flammeum, other- 

 wise more like macrurum ; Leptobasis mammilaris has the 

 tooth still shorter, that is more basal, and weaker; in Lepto- 

 basis vacillans it is smaller than in mammilaris. 



A study of the spines on the legs of various species shows 

 a surprising variation in the number of spines and their dis- 

 tribution or spacing in each species, and no characters of speci- 

 fic or generic value have been detected. The closer spines 

 are set together the longer they appear, other things being 

 equal, since one estimates their length largely in terms of the 

 interspaces. 



Aeolagrion demararum n. sp. (PI. XVIII, fig. 22, text tigs. 17, 18). 

 Abdomen $ 27-28, 9 27-30; hind wing, $ 16-17, 5 17.5-18.5. 



$ . Labrum to median ocellus, including genae, light dull brown 

 to bright blue green, with all intermediate stages, in specimens other- 

 wise apparently of the same age, the green in transitional specimens 

 appears first on labrum, rhinarium and nasus, and last on the frons 

 above. Head above dark green to black, marked with dull orange in 

 a varying degree; area enclosed by ocelli dark; from this dark area, 

 posterior to the lateral ocelli, on either side a dark bar runs outward 

 and forward, ending behind the antenna and reaching neither the an- 

 tenna nor the eye ; anterior to this bar the head is pale except that 

 usually there is a short bar on either side of the median ocellus, reach- 

 ing about half-way to the antenna; at its outer posterior portion the 

 dark bar from each lateral ocellus joins with a large dark area which 

 occupies the entire posterior dorsal surface of the head except a pale 

 occipital crest with a dilatation of varying size at either end; in some 

 specimens this pale occipital area is blue or green instead of dull 

 orange. Usually the large posterior dark area rests against the eye, 

 but it may be separated by the merest line of pale blue or green. In a 

 few very mature specimens, as shown by the pruinescent under parts 

 of the thorax, the occipital pale area is scarcely or not discernible, and 

 the pale areas on either side and in front of the ocelli are very dark 

 and obscure, so that, at first glance, the entire dorsal surface of the 

 head, excepting the frons, appears black. Rear of head pale, white or 

 bluish. 



Prothorax with front lobe pale blue, the lateral margins light brown, 

 to entirely bright blue; in paler individuals the middle and hind lobes 



