312 HYMEN OPTEEA. 



whereas in M. herherti it is flat at the extreme base, from which it then rises gradually 

 and roundly. 



^ 61. MutiUa, idiasta. 



Long. 6 millim. S • 



Hob. Mexico, Tierra Colorada 2000 feet, and Chilpancingo 4600 feet, both in 

 Guerrero (H. H. Smith). 



Head a little narrower than the thorax, well developed behind the eyes and obliquely 

 narrowed there, rugosely punctured ; covered with a silvery pubescence, and on the 

 vertex with long pale hair; the clypeus projecting in the middle, and with a wide 

 furrow down the centre, the furrow continued to the extreme apex, the sides almost 

 forming teeth ; the apical half of the mandibles ferruginous. The scape of the antennae 

 covered with white hair ; the flagellum with a fuscous pubescence ; the third joint 

 nearly one half longer than the fourth. The pro thorax transverse at the base, the 

 apex rounded, the sides straight; coarsely punctured, covered above with silvery 

 pubescence. The mesonotum covered with large reticulations and sparsely clothed 

 with long glistening white hair. The scutellum also reticulated, but the reticulations 

 are smaller and coarser, running into punctures ; it bears all over long pale fulvous 

 hair. The median segment above is covered with dense silvery pubescence, which 

 hides the sculpture ; the base has a gentle slope ; the apex is sharply oblique, shining 

 and glabrous, and has two not very distinct keels running down the centre. The 

 propleurae shining, glabrous, a little depressed, and with a few oblique keels ; the 

 mesopleurae punctured and densely covered with silvery hair, except at the apex ; 

 the metapleurse strongly reticulated behind. The tegulse are large, the sides carinate ; 

 sparsely covered with white hair. The petiole is wider than long ; at the base it is 

 oblique, projecting into short stout teeth, the top of the truncated part being margined ; 

 the other parts are coarsely punctured and covered with silvery hair. The second 

 abdominal segment is rather strongly punctured all over, and at the apex has a band 

 of white pubescence ; the other segments are finely punctured and fringed with white 

 hair. The pygidium is closely punctured and covered with short white hair, and stoutly 

 keeled down the centre ; the apex is transverse. The basal ventral segment has a 

 straight keel ; the second segment is more coarsely punctured than the corresponding 

 dorsal segment, and it is fringed with white hair at the apex ; the hypopygium is white. 

 The legs are covered with white hair ; the apices of the femora ferruginous ; the cal- 

 caria and spines white. The wings are fusco-hyaline. The radial cellule narrowish ; 

 the basal and apical abscissae of the radius straight, oblique, the basal abscissa larger 

 than the apical. The first cubital cellule shorter than the second ; the third cubital 

 cellule not reaching the apex of the radial. The first transverse cubital nervure 

 oblique and straight; the second curves towards the first; the third is angled sharply 



