FAMILY v.— TRYXALIN.^. 117 



This is a very uncommon insect in Minnesota, and only- 

 one pair was found late in summer upon Gray Cloud Island. 

 Closer collecting will doubtless show that it occurs also in 

 other parts of the state, as the species has an extended range, 

 occurring from Illinois to New York, in New England, and 

 from Iowa to Utah. 



GENUS Opeia McNeill. 



Vertex nearly horizontal, shorter than the distance be- 

 tween the eyes, convex, a little sulcate behind the prominent 

 lateral carinae which meet at an angle of about 90 degrees. 

 Median line distinct. Lateral foveolae not visible from 

 above, they are small sulci which extend from the ocelli 

 toward the vertex and are not clearly separated from the 

 front. The frontal costa is sulcate except at the apex, and 

 its margins are slightly and regularly expanded downward. 

 Seen from the side, the face is straight and strongly decliv- 

 ent. The antennee are considerably flattened basally and 

 regularly acuminate, distinctly shorter than the head and 

 pronotum. The pronotum has the disk nearly plain, being 

 slightly elevated to the median carina. This and the lateral 

 carinae are unusually heavy and distinct and all three are cut 

 by the principal sulcus onlv much behind the middle. The 

 lateral carinas are very slightly divergent from the middle of 

 the pronotum to the posterior margin which is roundly an- 

 gulate. The lateral lobes of the pronotum are not quite so 

 high as long; they are nearly perpendicular, being very 

 slightly convex above, and they have a nearly horizontal 

 carina extending from the middle to the postrior margin. 

 They have the anterior and posterior borders strongly 

 oblique with the lower margin nearly straight. There is no 

 posterior tubercle. The mesosternal lobes are separated 

 (female ) by a space about as long as wide, the metasternal 

 lobes by a space longer than wide (female) or nearly contig- 

 uous (male). The tegmina are little shorter than the abdo- 

 men (female). The discoidal area is occupied by a weak 



