400 HYMENOPTEKA. 



5. Agathis tibialis. (Tab. XVI. fig. 13, $ .) 



Ferrugineus, capite, antennis, palpis, mesosterno, trochanteribus, tibiis tarsisque posterioribus nigris, facie 



orbitisque late rufis ; alis f uliginosis. $ . 

 Long. 8-5 millim. ; terebra 4-5 millim. 



Hab. Mexico, Presidio (Forrer). 



Antennae nearly as long as the body, microscopically pilose, tapering distinctly towards 

 the apex. Head and thorax shining, impunctate ; metanotum rugose, 6-keeled. 

 Abdomen not much longer than the head and thorax united, much narrower than the 

 thorax, smooth, impunctate. Legs stout ; femora shining, sparsely covered with 

 rather long white hairs ; the apices of the four anterior coxee, and the whole of the hind 

 coxae and trochanters, black ; the hind tibiae obscure reddish on the inner side towards 

 the middle ; the anterior tibiae darker than the others ; the spurs reddish. Wings : 

 areolet oblique, of equal width throughout, a little longer than broad ; an interrupted 

 white cloud below the base of the stigma. 



6. Agathis ferrugineus. (Tab. XVI. fig. 11, $ .) 



Ferrugineus, nitidus, antennis tarsisque posticis nigris ; alis fuliginosis. § . 

 Long. 9 millim. ; terebra fere 4 millim. 



Hab. Mexico, Presidio {Forrer). 



Antennae nearly as long as the body, microscopically pilose. Mesothoracic lobes well- 

 developed, the middle lobe longitudinally furrowed. Metanotum transversely strio- 

 lated, longitudinally keeled. Abdomen about the length of the head and thorax 

 united. Wings as in A. tibialis. 



EAKINUS. 



Earinus, Wesmael, Nouv. Mem. Acad. Brux. 1837, p. 8. 



This genus only differs from Microdus in the first discoidal cellule being separated 

 from the first cubital cellule. This is quite an artificial character, and Earinus would 

 be better united with Microdus. The three divisions into which I have divided the 

 latter genus might as well be raised to generic rank if we retain it as distinct from 

 Earinus, for the presence or absence of the suturiform articulation is of more importance 

 than the partial obliteration of a nervure. In the only species of Earinus known 

 from our region the mesonotum is trilobate. 



/Kl. Earinus erythropoda. (Tab. XVI. fig. 20, $ .) 



Niger, nitidus, pedibus rufis, tibiis posticis pallidis, apice late tarsisque posticis nigris ; alis fumatis. $ . 

 Long. 9 millim. ; terebra 5 millim. 



Hab. Mexico, Northern Sonora [Morrison). 



Antennae a little shorter than the body, almost bare. Face densely, the top more 



