UHLER ON INSECTS. 4:66 



the posterior margin, aud one near tlie inner angle of the clavus] yellow; 

 the base of the costal margin is less expanded than in the preceding 

 species ; membrane blackish, with a transverse series of oblong, pale 

 spots behind the base ; the cuneus yellow, but black at base. Venter 

 black, polished, very minutely punctate, remotely, finely pubescent, the 

 segments margined behind and exteriorly with white. Male genital 

 segment very closely set with long bristles, with still longer, very 

 slender, strongly curved appendages, and with two short teeth on the 

 middle superiorly. The other attachments are not disclosed in my speci- 

 mens. 



Length to tip of venter 4-5 millimeters ; to tip of membrane 5^-6 

 millimeters. Width of base of pronotum 2-3 millimeters. 



A sprigh tly species, which inhabits dark rocks in the beds of running 

 creeks and brooks in the metamorphic region of Maryland ; and of 

 Eastern Massachusetts, near Waltham and West Cambridge, from May 

 till October. It flies from rock to rock on such as are not covered by 

 the water, and from its wariness and activity is quite difficult to capture. 



Mr. Kennicott found specimens in Illinois j others have been sent to 

 me from Ottawa, Canada, by Mr. Billings. Mr. Scudder collected it 

 near Lake Winnipeg. Mr. Sanborn met with it on the Magalloway 

 River in Maine, and on a brook near Andover, Mass. The Abb6 

 Provancher sent me specimens from Port Neuf near Quebec, and Mr. 

 Say's came from Indiana. 



3. S. conflnens. 



Acaniliia confluenia Say, Heteropt. New Harmony, 25, No. 5. 

 AcantMa confluens Say (emend. Le Coute), Complete Writings, i, 361, No. .5. 



" Black ; membrane of the hemely tra with a blackish band. Anten- 

 nce pale at base ; head and thorax immaculate ; corium with a large 

 marginal spot before the middle, and another at tip, two small spots ; 

 membrane with fuscous nervures and a continuous, blackish, arcuated 

 band on the middle ; feet whitish, tarsi with blackish tips j thighs with 

 an obsolete brown line ; venter whitish at tip." 



" Length to tip of tieraelytra one-fourth of an inch. 



" Inhabits the United States. 



" The baud of the membrane does not reach the inner margin. It is 

 equal in size to A. ligata.^^ 



Unless this is a variety of S. signoretii, I am not acquainted with it. 

 Some of the characters agree well with that species, but certain dis- 

 crepancies separate it from any that I have yet seen. 



Fuller series of these interesting insects are yet needed to do fall 

 justice to their relationships, and to settle their position in the scale of 

 the Hemiptera. 



4. S.pellita, new sp. 



Broa<l-ovate, dull ochreotestaceous or clay-yellow, above clothed with 

 erect, moderately long, close, fuscous pubescence, which is longer on 

 the head and margins of the pronotum. Face longer, more oblique 



