144 ODONATA FROM EAST AFRICA— CALVEBT. voL.xviir. 



TRITHEMIS RUBRINERVIS, Selys. 



Lihellula ruhrinervis, Selys, Rev. Zool., 1841, p. 244; Explor. Alger. Zool., Ill, p. 



120, N6vr., pi. I, tig. 5 (1849). 

 Tnthemis ruhrinervis, Calvert. Proc. U. S. Nat. Mus., XVI, 1893, p. 585, figs. 8, 9. 



Two males, one female. Xo black on the labium. Abdomen: male 

 23-25, female 21 ; hiud wiug- : male 28-30.5, female 29. 



CROCOTHEMIS ERYTHR.EA, Brulle. 



LibeUula erythrcca, Brulle, Exped. de Mor^e, III (1), p. 102, pi. 32, fig. 4 (1832). 

 Crocotliemis irythrwa, Calvert, Proc. U. S. Nat. Mus., XVI, 1893, p. 585, fig. 10. 



Two females, abdomen 24.5, hind wing 31.5; sectors of the triangle 

 of the hind wings separated at their origins. It closely resembles 

 Trithemis femigaria, Rambur, of the same country, but differs in the 

 stouter abdomen, and in the vulvar lamina being more nearly erect 

 and not reaching as far as the apex of the tenth abdominal segment. 

 It must be mentioned, however, that the vulvar lamina in these two 

 females is relatively longer than in European specimens of C. erytliram} 



CACERGATES UNIFASCIATA, Olivier (teste Selys). 



Cacergatea uiiifasciata, Calvert, Proc. U. S. Nat. Mus., XVI, 1893, p. 585, figs. 

 6,7. 



Two males, six females; no trace of the dark-brown band on the 

 wings of the females. Abdomen: male 18, female 16.5-18; hind wing: 

 male 25.5, female 24-25. 



DIPLACODES LEFEBVREI, Rambur. 



Lihellula lefehvrei, L. parvula, L. flavistyla, Rambur, N^vr., p. 112, 116, 117, 1842. 



Lihellula flavistyla, Selys, Explor. Alger. Zool., Ill, p. 124, N6vr., pi. i, fig. 7, 



1849. 



One male, last four abdominal segments wanting. Genitalia not 



prominent. Anterior lamina almost flat, projecting less than any other 



part ; margin entire, Hamule small, its apical fourth bifid, inner branch 



slender, slightly curved but not hooked, apex acute; outer branch 



iDr. Karscli writes (Berlin. Ent. Zeit., XXXVIII, p. 23, footnote, 1893), "Calvert 

 recently erects (Trans. Am. Ent. Soc, XIX, 1892, p. 162) a Trithemis erythrcea Brulle; 

 this is an untenable mode of desiguation, since Brauer described a true Trithemis 

 from the Island of Mauritius, very different from Lihellula eryihrwa, Brullf^, as Tri- 

 themis erythrcea, which indeed is vainly to be sought for in Kirby's Synonymic Cat- 

 alogue of Neuroptera Odonata, London, 1890." The reply to this criticism is that 

 the erythrwa from Mauritius described by Brauer (Verh. k. k. zool.-bot. Gesell. 

 Wien, XVII, p. 814, 1867), is a Tramea and not a Trithemis, and is to be found in 

 Kirby's Catalogue, p. 4. One may surmise that Dr. Karsch has merely copied the 

 error of de Borre's " Repertoire Alphabetique," etc. (Mem. Roy. Soc. Sci. Liege (2), 

 XVI, No. 4, 1889), where, on p. 18, C. erythrwa, Brauer, with the reference to the 

 Verh. k. k. zool.-bot. Gesell., etc., just given, is incorrectly referred to Trithemis 

 instead of Tramea. Dr. Brauer, in his " Verzeichniss der Neuropteren " of 1868 does 

 not mention his own erythrcea. 



