1878.] 35 



desckiptiojV of a new species of coedulegastek from 



costa kica. 



BY R. McLACHLAN, F.R.S., &c. 



The fine new Dragon-Fly described below was taken by Mr. H. 

 Rogers on the volcano known as Mt. Ii'azu (at an elevation of between 

 6000 and 7000 feet), and was sent home by him to Messrs. Salvin and 

 Godman. I examined three i^ and one $ . 



COEDULEaASTER GODMANI, 11. sp. 



Occiput brown, with a crest of blackish hairs : back of the head (behind tlie ejes) 

 jellow. Front brown (black about the ocelli), above ciliated with black ; the ex- 

 cavated superior portion darker, almost blackish. Nasus yellow, slightlj brownish 

 in the middle. Ehinarium dark brown or fuscous. Labrum yellow, slightly 

 brownish on the sides. Labium and palpi yellow. 



Body black. Thorax clothed with yellowish-grey hairs ; above with two cu- 

 neiform yellow stripes, broadest posteriorly ; sides with two narrow oblique yellow 

 bands, the lower the broader, the intermediate band indicated by two widely separated 

 yellow spots (most conspicuous in the ?). Legs black; femora piceous externally 

 (excepting at the tips). Abdomen brownish at the base ; second segment with a 

 complete yellow ring, very narrow on the middle above, joining and including the 

 oreillettes in the $ , becoming gradually broader and very oblique on the sides in the 

 $ , the posterior margin of this segment above with two yellow transverse spots 

 widely separated, and the margins of the genital suture are broadly yellow ; 3rd to 

 7th segments with a narrow median yellow ring, interrupted on the middle above, 

 on the 3rd to 5th there are also two widely separated postei-ior yellow spots; 8th 

 with a broad complete yellow median ring, expanding on the sides posteriorly ; 10th 

 with a narrower complete basal yellow ring. 



Appendages of the S black : the superior scarcely so long as the 10th segment, 

 somewhat dolabriform, the apical edge very oblique ; beneath they are furnished 

 with two teeth, one basal, triangular and rather large, the other ante-median, smaller, 

 and slightly hook-shaped : inferior appendages nearly quadrate, slightly narrower 

 in front, the apex excised. In the ? the vulvar horns are piceous, and extended 

 somewhat beyond the apex of the abdomen. 



Wings hyaline, strongly tinged with brownish in the very adult <? , and then 

 slightly yellowish at the extreme base (more conspicuously so in the ? ); costal edge 

 finely yellowish outwardly ; pterostigma narrow (4 mm. long), black; raembranule 

 pale cinereous, 19 — 21 ante-cubital, and 14 — 16 post-cubital nervules in the anterior- 

 wings. 



Length of abdomen, <? , 55 mm. ; ? , 58 mm. Length of posterior-wing, ^ , 

 45 mm. ; ? , 50 mm. 



In the very adult $ (and also in the ^ ) the yellow markings of the abdomen 

 are apparently sometimes nearly obliterated. 



Among American species this should come nearest to C. maculatus 

 and C. diadema, but is abundantly distinct from either in the character 

 of the markings. 



Lewisham : June, 1878. 



