128 GEO. H. HORN, M. D. 



denticulate claws while two have them absolutely simple, and Chaudoir 

 has already supposed that one of the latter may be a Peronosc&lis 

 although the species was unknown to him in nature. 



Tetragonoderus is represented in our fauna by four species which 

 may be arranged in the following manner : 



Claws serrate, (Tetragonoherus). 



Prosternum margined at tip. Elytra in great part piceous. Legs and outer 



joints of antennae piceous intersecttis Germ. 



Prosternum not margined at tip. Elytra in great part testaceous. Legs and 



antennae testaceous Tasciatus Hald. 



Claws simple, no trace of serration, (Peronoscelis ?). 



Prosternum slightly protuberant, margined at tip. Elytra broadly oval, the 



dorsal punctures distinct. Eyes convex lal ipoiinis Lee. 



Prosternum obtuse, not margined. Elytra oblong-oval, the dorsal punctures, 

 indistinct. Eyes not prominent...*. pallidum Horn. 



T. illtersectus Germ. — Piceous, upper surface somewhat bronzed. Antennas 

 with two basal joints pale. Head smooth. Thorax nearly twice as wide as long, 

 base and apex equal, sides arcuate, slightly sinuate posteriorly, hind angles distinct 

 not prominent, disc smooth, median line distinctly impressed but attaining neither 

 the apex nor base. Elytra oval slightly oblong, finely striate, intervals slightly 

 convex, dorsal punctures distinct, situated on the third interval, the anterior 

 somewhat in front of middle near the third stria, the posterior one-fourth from 

 apex near the second stria; color piceous with bronze surface lustre, with a pale 

 space on the intervals 5 — fi — 7 near the base, one in interrupted sinuous band 

 at apical third testaceous. Prosternum margined at tip. Legs piceo-testaceous. 

 Claws serrate. Length .20 inch; 5 mm. 



Male. — The anterior tarsi have three joints moderately dilated and slightly 

 squamulose beneath, the middle tarsi with joints 2 — 4 more narrowly dilated. 

 The last ventral segment is acutely notched at middle posteriorly and on each 

 side one setigerous puncture. 



Female. — Tarsi slender. Anal segment entire and with two setse on each side. 

 Chaudoir places this species in a series in which the prosternum is 

 not margined. The resemblance of this insect to a Bembldium of the 

 Notaphus group is certainly remarkable and it is usually found in that 

 vicinity in amateur collections. 



Occurs in the States bordering the Gulf. 



T. Fasciatus Hald. — Piceous. slightly bronzed, antennae and legs testaceous, 

 elytra fasciate with testaceous. Thorax similar in form to intersectus but less 

 broad and with the sides less arcuate in front. Elytra also more oval, more deeply 

 striate and with the intervals distinctly convex, dorsal punctures as in intersectus ; 

 the color usually in great part testaceous with a semicircular space around the 

 scutellum, a broad sinuous band with irregular edges at middle, and the apical 

 fourth piceous. Prosternum obtuse, not distinctly margined at tip. Claws serrate. 

 Length .18 inch: 4.5 mm. 



The sexual characters are as in intersectus. 



This species has a far wider distribution than the preceding, occuring 



