ACANTHOCHALCIS.— EUCHABINA. 101 



* — 1. Acanthochaltis nigricans. (Tab. VI. fig. 14, 2 ; 14 a, apex of abdomen.) 



Nigra ; geniculis, abdominis apice terebraque rufis ; alis hyalinis, apice famatis. 

 Long. 11 millim., terebra 4 millim. 



Hab. Mexico, Northern Sonora (Morrison). 



Head and thorax coarsely and rugosely punctured, finer at the base of the meso- 

 notum and sides of the collar. Mesopleura with a large deep oblique excavation 

 (which is finely striated and reaches to the bottom) between the second and third 

 pairs of legs ; close to the prothorax there is a semi-perpendicular excavation, also 

 striated. Scutellum large, rounded above ; a little down from the apex is a projecting 

 neck, above which is a single row of reticulations, and there is another row extending 

 right across the thorax beneath it. Metanotum contracted in the middle; the sides 

 project into a large triangle, flat above, the apex of it projecting over the rest. 

 Abdomen closely punctured, except at the junction of the segments, where there is a 

 shining impunctate band. The ovipositor is broad, compressed laterally, and with a 

 groove in the side, which, however, does not extend to the apex ; there are three large 

 teeth on the lower side of the apical segment. Coxae (especially the large hind pair) 

 punctured, as are also the posterior femora. The tarsi are covered closely with bristle- 

 like hair, especially thick on the underside ; tibiae with longer, thinner, more depressed 

 hair. The head is covered with white glistening hair ; there is a tuft of white silvery 

 hair on either side in front of the scutellum, a tuft at the base of the hind coxae, 

 a smaller one at the apex, and a large tuft on each side of the third and fourth 

 segments. The edge of the pronotum behind, a spot below the tegulae, one on the 

 mesopleura, and more or less of the scutellum are ferrugineous. 



EUCHARINA. 



This group contains some of the most remarkable forms of Chalcididee. Considerable 

 variation is shown in the structure of the antennae ; in many males the joints bear long 

 rami, either one or two to a joint. The most striking peculiarity, however, is exhibited 

 by the scutellum, which in most of the genera is provided at the apex with two processes 

 which, from being mere short teeth in some, become developed in others into long 

 processes which project beyond the apex of the abdomen, and may be so broad as to 

 cover it completely. 



Genera are found in all parts of the world ; these at present stand in need of revision. 

 There are not, I think, more than six South- American genera, and only four have yet 

 been found within our limit. These may be distinguished as follows : — 



1 (2). Scutellum simple at apex. Antennae 13-jointed, simple in both sexes . Orasema. 



2 (3) . Scutellum ending in two short blunt teeth, which are not much longer 



than broad. Sides of metathorax with a leaf-like expansion at apex. 



Antennse serrate in female, simple in male ....:..«• Lophyrocera. 



