96 GEO. n. HORN. M. D. 



With this species begins a small group of Arizona species with a gen- 

 erally broader and more depressed facies. The present species varies but 

 little in color except that the abdomen may become darker than the 

 thorax, and elytra approaching ventrale, in which case the color of the 

 head and the more distinctly punctured abdomen will distinguish the 

 present species. 



Occurs in Arizona near the southern boundary. 



13. C arizoiieiise n. sp. — Rufo-testaceousorcastaneous, shining, head not 

 darker except rarely at the sides, very sparsely pubescent. Antennse rufo-testa- 

 ceous, shorter than the head and thorax, tliird joint longer than the second. 

 Head oval, less shining, sides slightly arcuate, a little broader at the hind angles 

 than between the eyes, surface moderately coarsely punctate, denser at the sides. 

 Thorax narrower than the head, one-fourth longer than wide, sides nearly parallel, 

 median smooth space well defined, on each side with coarse and deep punctures, 

 closely placed in front, distant near the side and posteriorly. Elytra one-third 

 wider than the thorax and distinctly longer, punctuation (hoarser and deep not 

 dense, regularly disposed. Al)dornen finely obsoletely punctured. Legs rufo-tes- 

 taceous. Length .4II-.42 inch ; 10-10.5 mm. 



Maie { Complete form). — Third ventral with a short plica at centre; fourth with 

 a longer plica but less distinct, the posterior margin prolonged in a lobe reaching 

 the middle of the sixth segment, tli* sides parallel, the apex obtuse; seventh 

 ventral entire (PI. 2, fig. ?j). 



Male { Incomplete form). — Third and fourth ventrals plicate as above, the lobe of 

 the fourth segment short, truncate and emargiiiate at tip, reaching only the mid- 

 dle of the fifth segment (PI. 2, fig. 4). 



Male (Imperfect form). — The plicce of the third and fourth ventrals rather more 

 distinct, the posterior margin of the fourth truncate, without trace of lobe (PI. 2, 

 fig. J). 



Friiiale. — Ventral segments simple, witliout trace of fovea or plica. 

 This !<pecies resemhlefi pimeriaiium, and may be distinguished in Ixith 

 sexes by the concolurous head and the obsolete punctuation of the abdo- 

 men. Tln! following species ' \'i \ has the abdomen conspicuously piceous. 

 Occurs in Arizona. 



II. C\ vifatiiin n. sp. — Rufo-testaceous, moderately shining, sparsely pu- 

 bescent, last two segments of abdoinen piceous. AntenniB rufo-testaceous, shorter 

 than the head and thorax, third joint longer than the second. Head oval, coarsely 

 and moderately closely punctate. Thorax narrower than the head, one-fourth 

 longer than wide, median smooth space narrow, the punct\ires each side coarse, 

 deep and closely placed. Elytra one-third wider than the thorax and distinctly 

 longer, the punctures coarse, deep and closely placed. Abdomen with distinct 

 punctuation but fine and sparsely placed. Legs testaceous. Length .42 inch : 

 10.5 mm. 



Male. — Unknown. 



Female. — Abdomen simple. 



This species resemhles /nmcrnmum, etc., in form and general appear- 

 ance. It differs from any species known to me in having the last two 



