264 



MR. R. M'lACHLAN ON A SYSTEMATIC 



A decidedly aberrant species ; yet, from an examination of the 

 2 only, it cannot be located in any other group. 



5. E. (?) festivus, Rambur. (Bubo festivus, Ramb. Nevrop. p. 356, 

 part.) Antennae rufescentes vix obscure annulatae, ad basin tiavidae ; 

 clava nigra. Frons occiputque flavi, ille cano-pilosus. Thorax supra 

 niger, vittis tribus, quarum una mediana' unaque utrinque, flavis, 

 ornata3. Pedes omnino flavi. Abdomen flavum, utrinque nigro- 

 maculatum fere vittatum, infra vitta mediana nigra signatum. Alae 

 vitreae ; subcosta radioque flavidis, venarum venularumque caeteris 

 nigricantibus ; pterostigmate brunnescente, nigro-venato. Long. corp. 

 10-12'"; exp. alar, antic. 29-30"', postic. 24-25"'. 



Hab. Senegal. 



This diagnosis has been made from Eambur's Senegal types. 

 Rambur considered he had both sexes. The two Senegal types 

 present very great differences in the form of the abdomen, one 

 having that part small and shrunken, the other very obese. If 

 they be really c? and 2 , then the insect cannot be an Encyo- 

 posis ; for the smaller one ( <$ ?) has no appendices. The type 

 from Madagascar is a different species, which I cannot separate 

 from my Suphalasca(?) africana (vide ante, p. 259). 



Genus Oocoo aster, Westivood. 



Wings broad, dilated in the middle; the extreme base of the 

 inner margin of the anterior pair with an excision, not ap- 

 pendiculate : network open ; branch of the lower cubitus con- 

 fluent with the postcosta in all the wings. 



AntenncB much shorter than the wings, straight, without hairs at 

 the base ; club broadly capitate. 



Eyes very large ; the upper division much larger than the lower. 



Thorax slightly villose. 



Abdomen shorter than the wings, subcylindrical in the 3 , ap- 

 pendices long and cylindrical, directed downwards and forci- 

 pate : strangled at the base, and afterwards very obese in 

 the $ ; with bright and varied markings. 



Leys with the spurs of the posterior tibiae equalling the first 

 tarsal joint. 



Hab. India. 



The 6 appears to be scarce : I have only seen that of O. seg- 

 mentator. The $ abdomen, although so conspicuously large when 

 gravid, shrinks to a size equal to that of the 6 when the ova 

 are deposited. 



