290 HYMENOPTERA. 



the teeth, which are black and very stout. The second segment sparsely punctured ; 

 the other segments more finely and closely punctured at the base, and fringed 

 with long fiery-ferruginous hair (the apical segment is missing). The basal ventral 

 segment is ferruginous, the keel extends to the apex and is triangular at the base ; the 

 other segments have scattered punctures. The legs covered with white hair ; the tarsi 

 reddish, densely covered with white hair, their spines reddish. The radial nervure 

 hardly reaches the apex of the third cubital cellule ; the basal abscissa of the radius 

 straight, oblique, a little shorter than the apical, which is roundly curved. The second 

 cubital cellule is shorter than the third and is slightly dilated in the middle ; the 

 recurrent nervure is received nearly in the middle. The third cubital cellule is angled 

 above the middle ; the top equals in length the space bounded by the second trans- 

 verse cubital and second recurrent nervures, the latter being received in the apical third 

 of the cellule. The basal nervure is almost interstitial. 



M. thura may be known from M. chroma and M. orthona by the hair on the vertex 

 being much less dense ; also by the toothed clypeus, the much more elongated punc- 

 tures on the mesonotum, and the longer and wider area on the median segment. 



J 35. Mlltilla forreri. (Tab. XIII. fig. 24, <j organ.) 



Long. 8-12 millim. c? . 



Hab. Mexico, Presidio de Mazatlan, Ventanas in Durango (Forrer). 



Head narrower than the thorax, densely covered with long pale fulvous pubescence, 

 which hides the sculpture. The eyes large; the head not much narrowed behind 

 them. The antennae black, the scape densely covered with griseous hair ; the flagellum 

 with a sparse pile ; the third joint a little longer than the fourth. The pronotum 

 densely covered with pale fulvous pubescence, arcuate behind. The mesonotum 

 sparsely covered with a blackish pubescence ; the middle irregularly reticulated, the 

 sides strongly punctured, a longitudinal furrow separating the two parts. The tegulae 

 large ; the fore part broadly concave ; the posterior part in the form of a rounded leaf- 

 like expansion, raised and reddish at the margin ; the mesonotum along the sides of the 

 tegulae deeply excavated. The scutellum broadly convex, coarsely punctured, covered 

 with long pale fulvous hair. The median segment at the base semioblique, the apex 

 abruptly oblique ; the base densely covered with pale fulvous pubescence, hiding the 

 sculpture; the apical region reticulated. The mesopleurae moderately strongly punc- 

 tured, densely covered with griseous hair; the metapleurse reticulated. The basal 

 segment of the abdomen shining, sparsely covered with long, soft, fuscous hair, marked 

 all over with large, distinctly separated punctures ; at the base are two stout, broad 

 black teeth directed forwards. The other segments have the punctures smaller and 

 closer, and are, at the apex, fringed with reddish-fulvous hair. The pygidium is 

 rather strongly punctured, except an impunctate space in the middle ; the sides with 

 long reddish-fulvous hair ; the extreme apex is depressed and roundly incised in the 



