226 HTMENOPTEEA. 



scutellum semireticulated, the centre of the metanotum reticulated, the pleurae 

 less distinctly; the sides of the mesonotum at the base finely reticulated. The 

 pleurae are yellow, except the sutures broadly, and a broad line along the fore 

 part of the sternal furrow; the edge of the pronotum has a broad yellow mark; 

 the tegulae, the tubercles beneath them, two elongated lines on the mesonotum, the 

 scutellum, the postscutellum, and two large marks on the metanotum, covering and 

 extending above the tubercles, yellow. Scutellum longer than broad, contracted from 

 the middle to the apex, the anterior part carinate. Metathoracic spines short, thick, 

 blunt. Petiole black, yellow along the sides, the apex of the postpetiole broadly yellow. 

 The second and third segments of the abdomen black, yellow at the apex ; the other 

 segments yellow. Legs longish, the hind pair much longer than the body ; the four 

 anterior trochanters and the femora and tarsi lined with black above ; posterior coxae 

 with a broad black line ; the trochanters, femora, and tibiae to near the apex lined with 

 black above ; the apex of the hind tarsi black. Areolet small, open at the apex. 



A shorter and much broader and stouter insect than M. costaricensis, and easily 

 known from it by the reticulated thorax, the wholly yellow scutellum, the black scu- 

 tellar carinas, the much shorter and thicker metathoracic spines, the black-lined tibiae, 

 and the much longer hind legs. 



4. Mesothorax with a white line on each lateral lobe and a white mark on each 

 side of the middle lobe. (Species 33 and 34.) 



33. Mesosteims euryaspis. 



Niger ; facie, orbitis lsete, pleuris, maculis mesonoti, metanoto (medio excepto), abdominisque segmentis apice, 



flavis ; pedibus fulvis ; eoxis flavis, posticis nigro-bilineatis ; alis hyalinis. 

 Long. 14 millim. ; terebra fere 4 millim. 



Eab. Mexico, Presidio (Forrer). 



Antennae longer than the body, the scape beneath and a broad ring on the flagellum 

 yellow. Head punctured, the apex of the mandibles, the vertex in the middle, and the 

 posterior part (except the orbits) black, the rest yellow. Thorax punctured, the punc- 

 tures running into striatjons on the sides ; the basal part of the metanotum semirugose, 

 the middle longitudinally rugose-striate, the apex transversely so ; metapleura rugose. 

 The pleurae are yellowish, except the sutures, a longitudinal line on the mesopleurae, 

 and the edge of the collar in front ; mesonotum black, the edges of the middle lobe and 

 two shorter lines at its base inside from these, the carinae in front of the scutellum, the 

 scutellum, the postscutellum, and the metanotum (except the space enclosed by the 

 two transverse keels), yellow. Scutellum punctured, quadrate, almost broader than lone. 

 Metathoracic tubercles broad, short. First abdominal segment yellow, a black mark 

 towards the apex ; second segment black, with a fulvous transverse mark at its base, its 

 apex and also those of the other segments, the sides and ventral surface, yellow. The 



