The Pentatomidae of Nebraska 23 



contiguous posterior to the scutellum; scutellum broadly rounded 



at the tip 3 



2. Margins of the head without comb-teeth or else the coria of the 

 hemelytra contiguous posterior to the scutellum ; scutellum acutely 



triangular or narrowed at tip 4 



3. Anterior sinus of pronotum with an impressed submarginal line 



Homaloporiis 

 3. Anterior sinus of pronotum without impressed submarginal line. 



Cydnus 



4. Prothorax anteriorly margined Pangaeus 



4. Prothorax not anteriorly margined 5 



5. Coria of the hemelytra not posteriorly contiguous; comb-teeth absent; 



scutellum rounded at tip Geotonius 



5. Coria of the hemelytra posteriorly contiguous; comb-teeth present; 

 scutellum acutely triangular 4mnestus 



Tribe CYDNINI 

 Genus Homaloporus Uhler 

 Homaloporus congruus Uhler. 



1877. Homaloporus congruus Uhler, Btill. U. S. Geol. Geog. Surv., Ill, 

 No. 2, p. 2,77. 



On August 31, 191 1, I obtained a perfect female and the dried 

 skins of three other individuals of a Homaloporus which I be- 

 lieve to be congruus. They agree with Uhler's description of that 

 species, but differ somewhat from the figures given by Signoret, 

 (Ann. Soc. ent. France, ser. 6, vol. i, pi. 10, fig. 47). Such dif- 

 ferences as do exist, however, may possibly be due to individual 

 variation, difference in locality, or other causes. 



Genus Cydnus Fabricius 

 Cydnus obliquus (Uhler). 



1872. Microportis obliquus Uhler, Rept. U. S. Geol. Surv., V, p. 394. 



I took a series of twelve adults and as many immature forms* 

 of this species at Halsey, Nebraska, August 31, and September 2, 

 191 1, in blowout sand. An additional pair are in the collection 

 from Sioux county. 



This is an interesting little form, varying in length from four to 

 five millimeters. Signoret gives a formula for the arrangement 



241 



