VOI 

 1893 



XVI,-] 

 )3. J 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



585 



Rnrmeisttir (Handlmcli der Entom., ii, ]>\k 855, 856) ]>laces caffra with species havinjj 

 " gleich aiifangs drei Zellenreiheu in deiu Felde hinter dem Dreieck dcr Yorder- 

 fliigel."* and with this these two specimens agrei;. These two sjicciinens also differ 

 from the characters of Thennorthemix by having the ])tero8tigma moderate; fore 

 wings with 14 ( <? ) or 13 ( 9 ) antecubitals, 10 ( <? ) or 9 ( 9 ) postcnbitals. discoidal 

 triangle traversed by one vein, one hypertrigonal, internal triangle of 'S (in one 

 Aving 4) cells; hind wings with triangle free, no hypertrigonals, sectors of the 

 triangle a little separated at base. 



Fl(i. 4. 

 (ii'iiitalia Libelliila cartVa ^i" Burm. 



Fig. 5. 

 Genitalia of Libcllula sp J'- 



Fig. 6. 



Geuitalia of Libellula uui- 



fasciata cT Oliv. 



Another male from Congo which, at first, I had also referred to caffra, may per- 

 hajis belong to another species, as there are differences in the genital hanmle and in 

 the coloring of the thorax. Unfortunately this male has also lost the greater ]»art 

 of the abdomen. (See accompanying figure, 5.) 



Libellula (Cacergates) unifasciata Oliv. (Figs. 6 and 7) (leucosticta Burm.). 



Eight males and three females from Congo. One male from Porto Grande, St. 

 Vincent. One male from Angola, December 9. 



The width of the dark band on the wings of the male varies; its least width on 

 the fore wings is from the level of the second postcubital to that of the ending of the 

 median sector; its greatest width on the same wings is from the level of the nodus 

 to that of the inner side of the pterostigma. 



This species is the tyjie of the genus Cacergates Kirby. 



Libellula (Trithemis) rubrinervis Solys. (PMgs. 8 and 9.) 

 One male and one female from Congo. 



Libellula (Crocothemis) erythraea Briill(^. (Fig. 10.) 

 One mal(! from Congo. 



Libellula (Urothemis) ed-wardsii Selys. (Fig. 11.) 



Three males from Congo agree with Baron de Selys's description (C. R. Soc. Ent. 

 Belg, 4Mai 1878, p. Ixv.) Another male from Congo agrees quite well with Rambur's 

 description of "s«/«^imu?a Burm." (N^vroptt>res, p. 112), and difi'ers from the males 

 of edwardsii by the general reddish color of its body and reticulation, and by the 

 size and color of the basal markings on the- hind wings. I can find no struc^tural 

 differences between it and the males of edwardsii. The three males of edwardsii 

 have on the hind wings a blackish-brown basal streak in the subcostal space and 



*It was not until after I had entirely completed tlie MS. of this jiaper that I 

 noticed that Dr. Karsch had previously pointed out (Berliner Ent. Zeit. x.xxiii, 

 p. 377. 1890) from the same quotation from Burmeister that caffra Burm. does not 

 belong to Thermorthemis. Dr. Karsch there states that caffra is unknown to 

 him.— P. P. C. 



