ATJLACUS.— GASTEETJPTION. 423 



AULACUS. 



Aulacus, J urine, Nouv. Meth. de Class, les Hymen, p. 89(1807). 

 A genus of almost universal distribution. 



1. Aulacus hyalinipennis. 



Aulacus hyalinipennis, Westw. Trans. Ent. Soc. Lond. iii. p. 265 (1843) l . 

 Eab. Mexico 1 . 



2. Aulacus ruficollis. (Tab. xvm. fig. 10, $ .) 



Niger, prothorace rafo, tarsis anterioribus testaceis ; alis byalinis, apice fasciaque substigmateli fuscis, stig- 



mate et nervis nigris. $ . 

 Long. 9 millim. ; terebra 6 millim. 



Hab. Guatemala, Torola 1000 feet (Champion). 



Antennae filiform, a little longer than the head and thorax united ; scape thick, 

 truncated at the apex, one half the length of the second joint; second joint thicker 

 than, and about one half the length of, the third joint ; the flagellum microscopically 

 pilose. Face rugose ; above the mouth covered with long silvery- white hair ; front 

 closely punctured; vertex impunctate. Mandibles piceous at the base. Prothorax 

 coarsely reticulated and striolated ; deeply incised above, the edges curved, touching the 

 head a little below the ocelli ; longer than broad, a little narrowed in front, truncated 

 behind, depressed in the middle above, the depression with stout keels ; there is a deep 

 oblique depression in the pleura. Mesothorax a little shorter than the prothorax ; 

 above rugosely reticulated ; pleurae rugosely punctured ; scutellum flat. Metathorax 

 rugosely punctured ; a deep transverse depression at the base. Abdomen shorter than 

 the thorax ; the petiole pyriform, and forming nearly two thirds of the total length of 

 the abdomen. The third and following segments are covered with white pile ; the 

 metathorax laterally and below the petiole bearing a longer and denser pile. 



Subfam. EVANIINM 



GASTEKUPTION. 



Gasteruption, Latreille, Precis Caract. Gen. des Ins. p. 113 (1796). 

 Famus, Fabricius, Ent. Syst. Suppl. p. 240 (1798). 



Species of Gasteruption are found in most parts of the world. 



