294 HYMENOPTEEA. 



^ 38. Mutilla mazatlansB. 



Long. 11 millim. 6 • 



Hob. Mexico, Presidio de Mazatlan (Forrer). 



Head, at least on the vertex, coarsely punctured, densely covered with a dull silvery 

 pubescence ; the clypeus shining, glabrous, the apex rounded and margined. The eyes 

 large ; the head not much developed behind them, and roundly narrowed; the man- 

 dibles dull piceous before the apex. The scape of the antennae is of equal width 

 throughout, grooved on the inner side above, sparsely covered with silvery hair; the 

 flagellum stout, covered with a dull pile, the basal joints closely united, the third and 

 fourth joints equal in length. The pronotum with large, round punctures, covered 

 with a dense silvery pubescence ; the apex broadly rounded. The mesonotum shining ; 

 the punctures close together and mostly elongate ; the hair silvery, thick along the 

 sides. The scutellum only very moderately convex, punctured like the mesonotum, 

 and covered with long pale hair. The median segment with a gradually rounded slope 

 to the apex, reticulated ; the base with a belt of depressed silvery pubescence, the 

 other parts covered with long pale hair ; the median area elongate, slightly and gradu- 

 ally narrowed to the apex, which is rounded. The tegulae are large, broad, developed 

 behind ; the base with a few pale hairs ; the apical half piceous. The propleurae have 

 a somewhat triangular, large, slightly excavated, shagreened area behind ; the meso- 

 pleurae are punctured rather strongly, except at the base and apex ; the metapleurse 

 are reticulated, the base only slightly compared to the apex, and there is an impunctate 

 curved belt near the base. The basal segment of the abdomen shining, impressed 

 with widely separated punctures, and covered with long white hair ; the teeth black 

 and stout. The second segment punctured, except in the middle ; the other segments 

 closely punctured all over, and fringed with ferruginous hair, and covered also with 

 long white hair, this being also the case with the second segment. The pygidium is 

 closely punctured, except a smooth, impunctate, glabrous, raised space, which extends 

 from the basal fourth to the apex, and gradually becomes broader behind, its own apex 

 being sharply oblique ; the sides are at the apical two thirds keeled ; the apex is 

 margined, transverse. The first ventral segment is black in the middle ; the raised 

 part at the base is triangular ; the keel is straight, without any depression ; its apex 

 is oblique. The second ventral segment is almost impunctate ; at the apex there is a 

 transverse depressed line, with large punctures in it. The other ventral segments are 

 punctured, except at the base, and all bear long white hairs. The hypopygium also is 

 covered with long white hair ; and a little beyond the middle are two flattened oblique 

 teeth, rounded at the apex. The wings are lighter coloured towards the base. The 

 radial cellule extends very slightly beyond the apex of the third cubital and is wide ; 

 the first abscissa of the radius is a little curved, and slightly shorter than the apical 

 abscissa, which is more distinctly curved ; the first cubital cellule is not much longer 



