570 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



variety of determinations listed above, even to the extent of one 

 hemipterist placing specimens of one series under two generic names. 

 The present species shows very little variation except in the abun- 

 dance of punctures laterally on the anterior pronotal lobe. An un- 

 usual number of specimens, all from Texas, bore ecological data with 

 such notes as "cotton, in roots in soil," "at light," "from soil," "peach 

 orchard," and "nighthawk stomach." 



Genus Dallasiellus Berg 



Stenocoris Signoret, 1880, p. xliv (nee Burmeister, 1839, p. 1010, in hemipterous 

 family Coreidae; nee Rambur, 1839, p. 139, in hemipterous family Lygaeidae). 

 Dallasia Bergroth, 1891, p. 235 (nee Stokes, 1886, p. 534, in Protozoa). 

 Dallasiellus Berg, 1901, p. 281. 



Colobophrys Horvdth, 1919, p. 244. New synonymy. 

 Geocnethus Horvdth, 1919, p. 245 (in part). New synonymy. 



Diagnosis. — This genus is best recognized among those cydnid 

 genera of the Western Hemisphere that lack a differentiated terminal 

 lobe of the osteolar peritreme by the incomplete, submarginal row of 

 setigerous punctures on the juga and the absence of a subapical, 

 impressed line on the pronotum. 



Description. — Size small to large, 3.7 to 11.5; form oval to parallel- 

 sided; dorsum less strongly convex than venter. 



Head: Length more than half width; eyes weakly to strongly pro- 

 jecting; juga as long as or longer than clypeus and convergent in 

 front of it; surface more or less flattened, with no punctures, scat- 

 tered punctures or coarse confluent punctures; margin with or with- 

 out fine dorsal carina; ocelli small to moderate, situated on or poste- 

 rior to line connecting hind margins of eyes; antennae 5-segmented, 

 relative lengths of segments variable, I usually shortest and V usually 

 longest; bucculae moderately to very high, reaching nearly or quite 

 to base of head; labium reaching from between middle coxae to third 

 sternite, II longest, I or IV shortest. 



Pronotum: Width less than to more than twice the length; side 

 margins usually narrowed from base, with submarginal row of setiger- 

 ous punctures; anterior margin moderately to deeply concave; trans- 

 verse impression median or postmedian, weakly to strongly impressed; 

 posterior margin broadly but shallowl}^ convex. 



Scutellum: Longer than broad, apex narrowed, less than half of 

 membranal suture; disc with or without punctures. 



Hemelytron: Corial areas well defined, membranal suture straight 

 or sinuate, lateral angle prolonged or not; corial punctation variable; 

 membrane less than half of hemelytral length, reaching or surpassing 

 apex of abdomen. 



