lo8 GEO. H. HORN, M. D. 



HYDWOBIl'S Schmidt. 



H. arizonensis n. sp. — Oblong oval, dark castaneous, moderately shining. 

 Antennae rufo-testaceous, club piceous. Head sparsely punctate; labrum deeply 

 bilobed. Thorax more than twice as wide as long, base and apex truncate, hind 

 angles obtuse, surface finely and sparsely punctate. Elytra as wide at base as the 

 thorax, oval, gradually narrowing to apex, finely striate, striae punctured, the in- 

 tervals not punctulate but transversely strigose, the 3-5-7 with distant punctures. 

 Metasternum coarsely punctured at the sides. Abdomen more finely and sparsely 

 punctate. Legs testaceous. Length .10 inch : 2.5 mm. 



One female specimen, with simple femora, belongs to the series indi- 

 cated by me with bilobed labrum and differs from all the species of that 

 .series by the distantly strigose elytra! intervals. 



One specimen, Arizona. 



SCYDMzENlD^. 



SCYDM.KXUS Latr. 



S. tleloriiiatus n. sp. -^Reddish Vji-own, shining, very sparsely pubescent. 

 Head oval, gradually narrowed behind the eyes, then suddenly constricted to a 

 neck, by which it is slightly separated from the thorax. Thorax conical, truncate 

 at apex and base, as long as wide at base, apex about one-fourth narrower, surface 

 smooth, shining. Elytra wider at base than the thorax, ovate, very little longer 

 than wide, widest at middle, then rapidly narrower to apex, base slightly depressed, 

 humeral umbone slightly prominent, surface shining, very sparsely and minutely 

 punctulate. Legs moderately long, femora not strongly clavate. Length .08 inch ; 

 2 mm. 



Male — Antennte with first joint cylindrical, slightly narrower toward the base, 

 second and third conical, similar, together longer than the first, fourth shorter and 

 slightly broader, fifth transversely oval, very broad, prolonged on the upper side, 

 sixth and seventh also transverse, narrower than the fifth, the seventh being a 

 little narrower than the sixth, eighth smaller than the seventh, rounded, ninth 

 broader and as long as the two preceding joints together, tenth conical, a little 

 wider than the ninth and one-third longer, eleventh oval, a little longer than the 

 tenth (PI. 5, fig. 11). 



This species may be referred to Schaum's stirps 4 ((jermar Zeitschr. 

 V, p. 405), by the distinct neck, the carinate mesosternum, the long 

 second joint of max. palpi, and the subulate terminal joint. 



The specimens before me would have been referred to S. hiformis 

 Maekl. (Bull. Mosc. 1852, ii, p. 330) but the author says that species 

 has a four-jointed club, and that the sides of the thorax are impressed in 

 front of base. 



Several specimens were collected by Mr. Crotch at Los Angeles, Cala. 



