HEMIPTERA OF COLORADO. 61 



throughout the summer, especially on water in ditches; 

 during winter hibernates under stones, rubbish, etc. (Baker). 

 Dolores, June 16th (Gillette). 



Ithnnotrechus marginatus Say. 



On surface of puddles in western suburbs of Denver in August (Uhler, 5). 

 Near Manitou, July 15th (Packard— see Uhler, 5). Common on Grape Creek, 

 West Cliff, Custer County, May 25th (Cockerell, 10). 



t/ininotrechus prochictiis Uhler n. sp. 



"Larger and somewhat more robust than L. marginatus Say. with long, somewhat 

 flattened, anal processes of a yellow color forming the prolonged ends of the flat, hroad 

 conneAivum, and is of the same color as the last three segments. Color of the upper 

 surface dark brown with a tinge of fuscous on the pronotum. Head of medium length, 

 fuscous, covered with silvery, scaly pubescence on the lower sides and beneath. The 

 antennae sliort and stout, rusty brown, the second and third joints a little thicker and 

 darker at tip, the second sliorter than tlie apical, but longer than the third, the basal one 

 a little longer than the superior line of liead, the fourth a little shorter, dark in color and 

 tapering towards the tip. Rostrum swollen at base, reaching a little beliind the anterior 

 coxae, with the tip black. Pronotum with the anterior lobe quadrangular and flat, a very 

 little shorter than wide, the anterior border a little thickened and raised, the middle line 

 behind this depressed and marked witli a short, yellow stripe, the posterior lobe evenly 

 rounded off. a little flatiened, destitute of a carinate Hue, lateral niirgi is narrowly 

 yellow; underside all silvery white. Legs of medium length, pale rusty beneath, the 

 posterior femora as long as from the base of posterior coxae to the end of venter. 

 Veins of corium prominent, two of the oval medio-apical areoles pale. Sutures of con- 

 nexivum pale, outer h:i,lf of the connexivura of the last three ventral segments including 

 most of the segments themselves and the cerci, yellow, the middle line of venter with 

 four ind >nted spots. 



Lengtli to end of anal segment 10 mm. Width of pronotum 2 mm. A .single female was 

 sent to me from Colorado." 



Fort Collins, April 13th (Gillette). 



Ifininoporiis rafosciitellatus Latr. 



From stagnant water above the Rio Grande (Rothrock— see Uhler, 2). 

 Mountains, July (Carpenter— see Uhler, 6). Seems to be common in Colorado, 

 where it attains to full proportions, and puts on its clearest russet-brown coat 

 (Uhler, 6). On sin-face of small ponds and puddles in depressions of plains 

 west of Denver, August 8th and later (Uhler, 5). Denver, July 28th (Packard 

 — see TJhler, 5). 



Hehnis concinnus Uhl. 



Fort Collins, April 7th to October 15th (Baker). 



Hebnis sobrinns Uhl. 



On margins of ponds west of Denver (Uhler, 5). 



Microvelia americana Uhler n. sp. 



"Dark brown, velvety above, more or less powdered with plumbeous, body a little 

 tapering behind the curved base of sides Head short, triangular before the eyes, 

 margined with silvery, prostrate pubescence from behind the eyes and along tlieir inner 

 border forward to the cheeks; the tliroat testaceous; middle line of liead obsoletely 

 callous-carinate; rostrum testaceous, piceous at base and tip, reaching to the posterior 

 line of the anterior coxae ; antennae slender, obscure testaceous, darker on tlie tip of the 



