PLECTROTETRA.—HEMIPHRYNUS. 265 
the tibize dilated at the apex, canaliculate, the intermediate and posterior pairs mucronate; the tarsi black, 
the first joint dilated, the claws bifid. 
Hab. Mexico, Santiago Iscuintla (Flohr). 
This species, the largest yet known of the genus, possesses the most important of the 
characters of Plectrotetra, viz. the transverse thorax and the bifid claws, but it wants 
the thoracic sulcus; the longitudinal groove on each side of the thorax, however, 
indicates the usual limit or interruption of the sulcus. The antenne are formed as in 
the typical species of Plectrotetra. A single specimen of this insect has been kindly 
added to my collection by Mr. Flohr. 
HEMIPHRYNUS. (To follow the genus Phrynocepha, p. 294.) 
Hemiphrynus, Horn, Trans. Am. Ent. Soc. xvi. p. 212 (1889). 
The generic name Hemiphrynus has been proposed by Dr. Horn to include Phryno- 
cepha intermedia, Jac., this insect differing from Phrynocepha in the scarcely sulcate 
tibie. Two other species are now added to it. Dr. Horn remarks (op. cit.) that 
P. elongata, Jac., also probably belongs to Hemiphrynus; P. elongata, however, has 
distinctly sulcate tibie. 
1. Hemiphrynus intermedius. 
Phrynocepha intermedia, Jac. huj. op. p. 293. 
Hemiphrynus intermedius, Horn, Trans. Am. Ent. Soc. xvi. p. 213°. 
To the locality given, add :—Norru America, Southern Arizona}. 
2. Hemiphrynus tenuicornis. (Tab. XLI. fig. 23, 3.) 
Fulvous, the antenne (the basal four joints excepted), breast, and abdomen black; thorax impunctate ; 
elytra dark violaceous, closely punctured, the interstices obsoletely longitudinally depressed. 
¢. Antenne as long as the body, the basal joints robust. 
¢@. Antenna entirely filiform. 
Length 13-2 lines. 
3. Head impunctate, the frontal elevations but little raised, elongate ; antenne as long as the body, black, 
the basal four joints fulvous, rather robust, the terminal joints gradually becoming thinner, the third 
joint very elongate, distinctly longer than the fourth; thorax about one half broader than long, narrowed 
in front, the sides rounded, the angles not prominent, the surface impunctate, with a shallow transverse 
basal sulcus on either side of the middle; scutellum black; elytra widened posteriorly, dark metallic 
violaceous, very finely and closely punctured, and with shallow longitudinal grooves ; legs robust, fulvous, 
- the tibie not channelled. 
Hab. Mexico, Yolotepec (Sallé). 
H. tenuicornis may be at once distinguished from H. intermedius by the colour and 
sculpture of the elytra in connection with the long antenne in both sexes; the elytral 
grooves are a little more strongly marked in the female than in the male. 
BIOL. CENTR.-AMER., Coleopt., Vol. VI. Pt. 1, Suppl., Judy 1891. 2m 
