8o DAVENPORT ACADEMY OF NATURAL SCIENCES. 



tic of those species. In color it approaches cinei-eus, but is quite 

 distinct structurally. The genitalia are quite distinctive and will 

 readily separate it from either of the above named species. 



Deltocephalus collinus Dahlb. 



Form of melsheimeri, nearly related to D. tnonticola but larger, lar- 

 ger than melsheimeri. Length, c?, Z-Z '^'^•\ ?? 4 nim.; width, i mm. 



Brachypterous form: Vertex flat, obtusely angled before, width and 

 length about equal, slightly more than half longer against eye than on 

 middle, anterior margin concave between the ocelli and the tip, the 

 outline, however, obscured by the rounding front, front transversely 

 convex, twice wider above than on clypeus, one-third longer than 

 wide, clypeus half longer than wide, gense scarcely angled below the 

 eyes, broadly margining the lorse below and attaining the apex of the 

 clypeus, pronotum two and one- half times wider than long, shorter 

 than vertex, anterior margin broadly rounding, posterior margin shal- 

 lowly emarginate, side margin short, not carinate. Elytra narrow, 

 shorter than abdomen, the tips divergent from the apex of the clavus, 

 reaching to the base of the penultimate segment, venation irregular, 

 the apical cells minute or wanting, the two inner anteapicals large, 

 outer very small or wanting. Wings proper, rudimentary. 



Color : Green, with brown eyes and a grayish-olive vertex, vertex 

 with a light median stripe enclosing the usual dark impressed line, a 

 light stripe next each eye and a short one on the middle of face on 

 either side, face olive-brown with dark sutures and light arcs, tip of 

 rostrum black, anterior margin of pronotum light-green, posterior por- 

 tion of disc darker, sometimes longitudinally striped with fuscous, ely- 

 tra green, nervures lighter, tip hyaline, posterior margin of abdominal 

 segments light green, disc green with slight fuscous markings, under 

 side with a silvery sheen, disc of abdominal segments black, some- 

 times a median light line. 



Macropie7'ous form : Structural characters as in the preceding form, 

 except that the side margins of the pronotum are shortened, allowmg 

 more freedom to the elytra. Elytra long, narrow, reaching the tips of 

 the pygofers, margins nearly parallel, the tips obliquely rounding and 

 slighly reflexed, giving the insect a linear aspect. Venation distinct, 

 slightly irregular, discoidal cell formed by the branching of the first 

 sector, long and narrow, outer anteapical cell very small, oval, apical 

 cells large, the second one long, wedge-shaped, curved, usually a {^-^ 



