Feb., '03] ENTOMOLOGICAL NEWS. 39 



inversion, longum~\ sont- chacune d'un type different sous le 

 rapport de la proportion des appendices anals, et quant au nic- 

 dstogastrum qui constitue le ae groupe, il est encore plus car- 

 acterise par son abdomen enormement long [50-52 mm. $ , 



37-39 9]-" 



Somatochlora provocans, n. sp. (PI. Ill, figs. 7, 8). 



<j\ Most of the face, including the labium, yellow ; free margin of the 

 labrum narrowly edged with black, a pair of small black spots on the 

 nasus ; frons superiorly metallic-violet or -greenish-blue, which extends 

 on to the anterior surface but does not reach the lower margin ; the yellow 

 on each lateral surface of the frons is consequently connected with its 

 fellow of the opposite side by a transverse, inferior frontal, yellow band ; 

 vertex metallic blue-violet, occiput and rear of the eyes black ; labrum, 

 occiput and rear of the eyes with numerous pale hairs, rest of the head 

 (except the eyes) with many blackish hairs. 



Front and hind prothoracic lobes very pale yellow almost white, middle 

 lobe dark brown ; hind margin of hind lobe convex, entire. 



Thorax and abdomen dark metallic-violet or -green with the following 

 yellow markings : upper end of mid-dorsal thoracic carina, anterior calli, 

 inter-alar dorsal area, a rather wide but isolated mesepimeral stripe, 'a 

 sinuous interrupted line just back of the metastigma, a fairly wide mete- 

 pimeral stripe which passes on to the metasternum and unites with its 

 fellow of the opposite side ; a narrow line along the apex of abdominal 

 segment i ; an oblique, inferior stripe each side at base of 2 ; a transverse 

 apical stripe on 2 running out inferiorly on to the posterior margin of the 

 genital lobe each side ; a triangular spot on each side of the mid-dorsal 

 line of 3, occupying the basal fourth of the segment. Conspicuous hairs 

 on the thoracic dorsum and dorsum of first two abdominal segments (pale) 

 and on the genitalia of 2 (dark). 



Legs black with the following yellowish : most of the coxae, first tro- 

 chanters, most of the first femora except near the knees, second femora 

 superiorly at base. Antero-inferior row of spines on all the femora termi- 

 nating in a longer and stouter spine. Not only do the first tibiae have the 

 inferior carina in their distal third, as described for the Cordulinae generally 

 by de Selys in 1871, but a similar pale inferior carina extends on almost 

 the entire length of the third tibiae.* The second tibiae are not carinate 

 in this manner. 



* Such a carina, which appears to be hollow within, exists on the third 

 tibiae of the males, but never of the females, of all species of Cordulinte 

 (sensu Selysii) which I have been able to examine. A similar carina is 

 found also on the second tibiae of species of Didyinops, Epophthalima, 

 Neiirocordulia, etc. Its nature and distribution deserve special exami- 

 nation. 



