PHILIP P. CALVERT. 67 



postnndals: internal triangle 3-celletl, discoidal triangle with one cross- vei ii ; 

 three posttriangular rows to the hind margin of the wing. 



Hind wings : — 7 antenodals, 8 postnodals, no internal triangle, discoidal triangle 

 free, two posttriangtilar lows increasing, sectors of the triangle arising from the 

 same point. 



Total length 33 mm., abdomen 23, superior appendages 2, third tibia 5.5, front 

 wing 28, hind wing 27, pterostigma 3.5. 



14. Liibellula arteriosa B. P. 850. [Trithemis.'] 



testaceo-rufa, abdomine et fronte summa sanguineis, alls hyallnis 

 in basi fulvis, venis omnibus sang-uineis, stigmatibus fuscis. Long-. 1,V'. 

 Vom Port natal; ein Mannchen, ebendaher. 



One male (j) under the blue drawer-label " arterio.sa Burm. Pr. 

 b. sp. Drg." in B.'s hand, at Halle; no pin-label other than a bit 

 of unmarked blue paper. The following notes were made on the 

 type : 



% (type). The fulvous coloring on the wing-bases is, on the front wings, con- 

 fined to the subcostal and submedian spaces, reaching not as far as the first ante- 

 nodal and the submedian cross-vein respectively. On the hind wings, it reaches 

 in the co.^tal and median spaces half-way to the first antenodal, in the subcostal 

 and submedian spaces to slightly beyond the first antenodal ; in the snbmedian 

 space it therefore reaches to beyond the cross-vein ; below (posterior to) the sub- 

 median space it reaches only as far as the ape.^ of the membranule and outwards 

 for but two cells from the membranule. The black on the labrum is confined to 

 the middle of the anterior margin. The genital hamule is much more like the 

 figure I have given (Proc. U. S. Nat. Mus. xvi, p. 585, 1893) of the hamule of 

 rubrinervis Selys than Dr. Karsch's figure of that of arteriosa Hn Berl. Ent. Zeit. 

 xxxix. p. 12, 1894). Abdomen 24 mm., liind wing 27- 



When at Halle I had with me a male from Ndi, Zanzibar, by Hildebrandt, 

 given me, as arteriosa, at the Museum fiir Naturkunde in Berlin ; I noted at the 

 time that the type of arterioxn agrees with this male in other respects than those 

 mentioned above. This male is now before me. It is slightly smaller — abdomen 

 22, hind wing 25 ; the brownish yellow at the base of the front wings reaches to 

 the second antenodal and thearculus and even a short distance beyond the latter 

 in the submedian space ; on the hind wings the same coloring reaches to the third 

 antenodal and the triangle, and from the anterior margin of the wing almost to 

 the posterior; black is the predominant color on the labrum, only two isolated 

 basal fulvous spots remaining; the hamule agrees with the figure of that of rxh- 

 rinervis cited above. With this male from Zanzibar agrees a male from Nossibe 

 given to me subsequently by Baron de Selys as arteriosa. 



15. Libellula riifinervis B. P. 850. [Di/themis.] 



Von St. Domingo, in Sommer's Sammlung. 



I have not seen the type which is in the Hofniuseuiu at Vienna 

 (Prof. Brauer). 



TRANS. AM. ENT. SOC. XXV. SEPTEMBER. 1898. 



