128 [November, 



DESCRIPTIONS OF THREE NEW EUROPEAN EPSEMERID^. 

 BY HERMAN ALBARDA [COMMUNICATED BT THE REV. A. E. EATOn]. 



CeNTROPTILUM TENELLUM, 11. sp. 



Imago $ . Ocidi turhinati atri,i)iferiores fusci. Thorax fuscus,poUtus. 

 AlcB vitrincE : antica; nervis longitudlnalibus prope basin, nervuloque humerali, 

 castaneo-margiiiatis ; posticce ligulata, ohtxisce. Pedes cretacei, coxis fuscis, 

 femoribus tibiisque ad basin et apicem atro-fusco-cingulatis, femore antico 

 insiiper cinguld prceapicaU ejusdem colons. Abdominis segmenta 2 — Q cre- 

 tacea, punctiiris fiirfarosis ; ccetera saturate castanea, subtus virescenti-grisea. 

 SetcB forcepsque albce. Long. corp. <?, 3; aZ. 4 ; set. 'imm. 



Sah. : the single male in my collection was taken by Mr. Van 

 Medenbacli de fiooy near Arnliem, Holland, on tlie 8tli September, 

 1878. 



This pretty little species may be easily separated from C. luteolum, 

 Miill., by tbe obtuseness of its hind wings, which are rather like those 

 of C stenopteryx, and from G. pennulatxim., Etn., as well as G. litura- 

 tum, Pict., by its small size and dark markings. 



ISONTCHIA EERRUGINEA, U. sp. 



Siibim. $ et ^ . Oculi maris fuscis {'^ p>aUidiores). Thorax luteo-piceus. 

 Alee luridcB, ad margiiies fumatcB, nervis transversalibus nigris,fusco-margina- 

 tis ; anticoi prope costam iiehulis fuscis spatia pallidiora inclatidentibus. 

 Pedes antici atro-jyicei, articulis tarsorum ad bases testaceis ; posteriores 

 testacei, tur.iisfuliginosis, imguibiis nigris. Abdomen fuscum,junctvris line- 

 isqite longittidinalihus abbreviatis iti apices segmentorum binis obscurioribus. 

 Seta saturate testacece, ad bases obscuriores, pube brevi appressd nisi ad 

 itinrturas ibique eddem in verticillis divergenti. Forceps fusea. 



Imago <? . Oculi fuliginosi [inter vitam apace-, vet brunneo-carnei, cin- 

 (/ttld ex diametro ochracea, macula rotundd (linedve curvatd) mobili nigra 

 interruptd intersecti. — A. E. Eaton.] Thorax piceo-luteus. Alee vitrinw, 

 ared pterostigmaticd vix hmdo-tinctd : nervorum longitudinales subtestacei, 

 transversales nigri, tenues. Us tamen in ared supra dictd parum incrassatis 

 exceptis. Pedes antici atro-picei, articulis tarsorum ad bases pallide tes- 

 taceis ; posteriores flavo-testacei, articulo unguinali infuscato. Abdomen 

 ferrugineum, junctiiris et in apicibus segmentorum lineis abbreviatis binis 

 piceis. SetcB pallide cervince, apud bases fusco-obscuratce. Forceps fusca, 

 articulo terminali pallidiore. 



? . Mari pallidior. Tarsus anticus articulo unguinali piceo, cceteris 

 albis, a^iicibns an guste piceis. Processus ventralisprofunde emarginatus. 

 Long. Corp. 12 — 15 ; al. 10 — 14; set. $ ? im. 25, subim. 16 mm. 



Hah. : Holland : Arnhem, Yasserbeck (Van Medenbach de Rooy); 



