MUTILLA. 285 



coarsely punctured ; the sides in front rounded, behind almost oblique to the middle, 

 which is bluntly rounded. The mesonotum with large, elongated, roundish punctures, 

 which almost form reticulations; its hair rather thick and fuscous in colour. The 

 scutellum broadly and moderately convex, coarsely punctured, and covered with long 

 fuscous hair. The tegulse are large, broad, projecting behind ; the base glabrous, the 

 apex thickly covered with dull silvery hair. The median segment has a gradually 

 rounded slope to the apex ; reticulated, the reticulations large and roundish ; the central 

 area elongated, reaching beyond the middle ; the sides curved at the middle and at the 

 apex ; the base has a whitish depressed pubescence ; the sides have long silvery white 

 hair. The propleurse excavated, at the base irregularly striolated ; the central part of 

 the mesopleurse is covered with large shallow punctures and with silvery pubescence ; 

 the base of the metapleurse impunctate, the rest reticulated. The basal segment of the 

 abdomen with large punctures, and covered with long white hair ; the second segment 

 with scattered punctures ; the other segments more closely punctured, except at the 

 base, and fringed with fiery-ferruginous hair. The pygidium punctured, covered with 

 pale fulvous hair ; the apex in the middle at the top and bottom terminates in stout 

 teeth, the space between them being roundly incised ; the sides towards the apex are 

 keeled and terminate in an indistinct tooth. The first ventral segment is flattened at 

 the base, raised at the apex, and in the centre are several keels ; the apex is punctured ; 

 the central keel is depressed in the middle. The second ventral segment is rather 

 strongly punctured, except at the apex. The hypopygium is rather strongly punctured. 

 Legs thickly covered with white hair. Wings fuscous ; the apex much deeper-coloured 

 than the basal portion. The radial cellule not reaching beyond the apex of the third 

 cubital cellule, wide ; the first abscissa of the radius straight, oblique, shorter than the 

 third, which is curved ; the first cubital cellule is longer than the second ; the first 

 transverse cubital nervure is oblique and with a slight curve, the second roundly curved, 

 the third very sharply angled above the middle ; the first recurrent nervure is received 

 a little beyond the middle, the second almost in the apical fourth; the transverse 

 median nervure is received in front of the basal. 



This species may be easily known from all the others here described by the scape of 

 the antennae being dilated broadly at the apex, and by the middle of the pygidium 

 being incised laterally and ending at the top and bottom in teeth. 



J 28. Mutilla aerolla, 



Long. 1 5 millim. S • 



Hab. Mexico, Dos Arroyos in Guerrero (E, H. Smith). 



Head coarsely punctured, covered with golden pubescence, more sparsely in the centre 

 of the vertex, which bears long fuscous hair ; the apex of the clypeus projecting, the 

 sides oblique, the centre with five indistinct tubercles, which do not project over the 

 apex; the mandibles punctured, piceous before the apex. The eyes large, the head 



