2808 Entomological Society. 



Sp. 2. Hylecthrus quercus. 



Differt rnagnitudine duplo majori, alis parum obscurioribus, nervisque magis ni- 



gricantibus. Mas. 

 Long. corp. | — 1 lin. Expans. alar, fere If lin. 

 Individuis mutilatis tantum vidi. 

 Habitat in Epiro, Hylaei gibbi parasitus. 



Order Hymenoptera. 



Section Mellifera, Latr. 



Family Andrenids:, Lair. 



Genus Hyl.eus, Latr. (Prosopis, Jurine). 



Sp. 1. Hyljeus rdbicola. 



Niger ; genis, clypeique puncto, luteis, vel albicantibus, vel denique omnino ni- 

 gris ; antennis subtus ferrugineis ; protboracis lineola saepe interrupta, humeris, 

 squamaque alarum, flavescentibus ; tibiis tarsisque plus minus ve ferrugineis 

 vel pallidis; abdominis segmento primo omnino, secundo nonnunquam ad 

 basin, rufo-fulvis, reliquis nigro-piceis, marginibus posticis pallidioribus ; alis 

 subhyalinis, nervis piceis. Femina. 



Long. corp. ^ unc. Exp. alar. 3 \ unc. 



Mas differt, genis clypeoque albidis ; thorace, abdomine, squamaque alarum, 

 nigris. 



Habitat in Epiro rubis exsiccatis circum Ambracicum sinum. 



Sp. 2. Hyletjs versicolor. 

 Niger ; genis, clypei linea, protboracis linea interrupta, humeris, squamaque ala- 

 rum, flavescentibus ; antennis subtus ferrugineis ; tibiis tarsisque anterioribus 

 fere omnino, intermediis posterioribusque basin versus, pallidioribus; abdo- 

 mine vel toto vel parte majori pallide flavo; alis subhyalinis, nervis piceis. 

 Femina. 

 Long. corp. ^ unc. Exp. alar. 2 \ unc. 



Variat genis luteis, clypei puncto concolori, vel disco omnino nigro. 

 Habitat in Epiro rubis exsiccatis cum praecedentibus. (An species distincta ?) 

 The dissimilarity in appearance between this and the preceding species is so 

 striking, that, although he inclined to consider the difference as resulting from 

 parasitical attack, it would perhaps be hazardous to assert this without further proof 

 of their identity. It is, however, remarkable that all the male parasites which he has 

 obtained were derived from these pale-coloured specimens, whereas the apterous fe- 

 males were restricted to the former, — a circumstance not unworthy of attention, as 

 connected with the physiology of sexual development. 



Sp. 3. Hyl^us gibbus. 



Niger, gibbosus; genis, tibiisque anterioribus antice, luteis; posterioribus ad 

 basin, intermediis vix, tarsorumque quatuor posteriorum articulo primo, albi- 

 cantibus ; antennis subtus ferrugineis ; protboracis lineola interrupta tenui, 

 humeris, alarumque squama, flavescentibus ; abdomine nigro ; alis fuscentibus, 

 nervis piceis. Femina. 



Long. corp. 3 lin. Expans. alar. 4£ lin. 



