120 



Dimensions. — 9 Length, 0.7 to 0.95 inch ; elytra, 0.7 to 0.8 inch ; hind 

 femora, 0.52 inch ; hind tibiae, 0.46 inch. ^ Length, 0.65 inch. 

 Massachusetts (Harr.) ; Connecticut (Scudder). 



ffi. hnydenii, Thos., Geol. Surv. Terr., 1871, 460. 



Head and thorax somewhat wrinkled. Vertex rather narrow; central 

 foveola somewhat elongate ; margins prominent, sharp, o'pen in front, contin- 

 uous with the sulcus of the frontal costa ; median carina distinct. Frontal 

 costa sulcate throughout, very narrow above the ocellus ; eyes prominent, 

 sub-globose. Antennae rather long. Pronotum tricarinate ; median carina 

 distinct, but not prominent ; lateral carinse distinct only on the posterior lobe; 

 third incision very distinct, nearly straight, cuts the median carina about the 

 middle ; anterior lobes with irregular i-aised lines ; posterior lobe elongate- 

 tuberculate ; apex blunt, right-angled. Elytra and wings passing the abdo- 

 men, narrow. Posterior femora slender. 



Color (dried after immersion in alcohol). — Dull clay-color, dotted with 

 fuscous. A transverse, fuscous stripe in front between the eyes. A small, 

 fuscous spot about the middle of each side of the pronotum Upper and 

 lower margins of the elytra marked with small, fuscous spots; middle field 

 nearly clear, a few minute, pale dots visible. Wings pale-yellow at base (red 

 when living), with a tolerably broad, fuscous band, narrowed in front and 

 behind, not reaching the anal angle; a sub-frontal ray of this band extends 

 nearly to the base; apex pellucid, with nerves partly ochreous and partly 

 dusky. Anterior and middle tarsi with two black annulations. Antennae 

 with alternate rings of yellow and fuscous ; the fuscous bands are much 

 broader than the yellow, and the single joints which the yellow occupy 

 appear to be smaller in diameter than the others ; the yellow portion is red 

 in the living insect, and the fuscous portion brown 



Color (of living insect). — Wings red at base. Antennse with alternate 

 rings of brown and red. General color, ash-gray, mottled with fuscous dots 

 and spots. 



Dimensions. — 9 Length, 0.9 to 1 inch; elytra, 0.87 inch; posterior 

 femora, 0.54 inch; posterior tibise, 0.45 inch. $ Length, 0.62 to 0.7 inch; 

 elytra, 0.7 inch. 



Colorado, Eastern Wyoming (Thomas). 



Named in lionor of Dr. F. V. Hayden, United States geologist. 



