NORTH AMERICAN COLEOPTERA. 215 



At first sight this insect is very like an Exochomus. The arcuate 

 red band on the thorax is absent in some specimens ; the red spot on 

 each elytron is in the form of a right angled triangle, the base 

 slightly behind the middle, the perpendicular is toward the sides, 

 while the hypothenuse is to the front. The spots meet at the 

 suture. The apex is also bordered with red as in some Scymnus. 



Occurs in Biscayne Bay, Florida. It is remarkable that the other 

 species of the genus occur in the Amur region and Japan. 



SPHJCRODER9IA Steph 



Head triangular, deeply inserted in the thorax, front obtusely 

 carinate, the callosities small, clypeus truncate, labrum feebl}^ emar- 

 ginate at middle. Maxillary palpi with second joint slender, third 

 short, obconical, fourth a little longer, acute. Eyes moderately 

 prominent, round. Antenme half as long as the body, slightly 

 thicker toward tip, first joint slightly clavate, second and third 

 equal, together as long as the first, 4-10 nearly equal, gradually 

 wider, eleventh longer, acuminate at tip. Thorax transverse, ante- 

 rior angles rounded, the posterior obtuse, margin narrowly explanate; 

 Elytra not wider at base than the thorax, punctuation generally 

 confused, substriate in places, epipleurae horizontal. Legs moderate, 

 hind thighs broadly oval. The tib'we broader at apex, the posterior 

 grooved on the outer face near the apex and with a small terminal 

 spur, and distinctly prolonged on the inner side beyond the insertion 

 of the tarsus. First joint of hind tarsi as long as the following 

 together, the claws broadly appendiculate at base. PI. VII, fig. 10. 



The form of the posterior tibia partake of the characters of Chte- 

 tocnema and Psylliodes, i. e., there is a slight sinuation near the apex 

 limited above by an indistinct angulation, and the tibia is prolonged 

 on the inner side beyond the insertion of the tarsus. The latter 

 character is not mentioned by Chapuis, and may probably difl^eren- 

 tiate our species generally fi'om the old world forms. 



One species is known in our fauna. 



S. opiina Lee. — Orbicular, couvex, piceous black, shining, front of head a 

 little paler. Antennte slender, pale rufotestaceous. Head closely punctate. 

 Thorax more than twice as wide as long, rapidly narrowed in front, the sides 

 nearly straight, rounded at the front angles, finely, moderately, closely punctate. 

 Elytra not wider at base than the thorax, humeri broadly rounded, umboue 

 feeble, the disc with coarse not close punctures forming rather irregular strife at 

 middle, but quite regular at the sides, intervals more finely puuctulatc. Epi- 

 pleura; paler. Body beneath piceous, tibite and tarsi reddish brown. Lengtli 

 .10 inch. ; 2.5 mm. 



