S6 TRANS. ST. LOUIS ACAD. SCIENCE. 



The abdomen is dorsally black with the extreme tip of joint i, and the 

 whole of joints 2 and 3 rufous, and ventrally black with joints 1-3 obscure 

 rufous. 3. The hind femora are immaculate. 4. The hind tibiae have 

 their basal i black, their next f white, their next I black gradually shading 

 into the terminal i which is bright rufous, thus presenting three distinct 

 colors, whence the specific name. The $ differs also in having no facial 

 white spot from the $ of [scuteltaris, Cress.] Length o* .20 inch; $2i-.27 

 inch. Length wing o* -19 inch; § -19-25 inch. 



One % , four ? . Separated at once from Mr. Cresson's two 

 species, and from \scutellaris, Cress.,] by the broad red band on 

 the abdomen and by the remarkable coloration of the hind tibiae. 



[This is probably only a variety of sycophanta. — Cresson.] 



Bassns sycophanta, Walsh, [Trans. Am. Ent. Soc. ii. p. 112].— Q..— 

 Differs from [scutellaris, Cress.] $ only as follows: — 1. The white spot 

 is not located on the disk of the face, but on its tip so as to connect with 

 the clypeus; and the orbits widen as they approach the clypeus so as to 

 be more or less confluent with the white spot. 2. The antennas are brown- 

 black immaculate. 3. Besides the described white markings of the tho- 

 rax, an abbreviated line on the front submargin of the mesothoracic pleura, 

 a line on the front submargin of the lower surface of the mesosternum, 

 which is prolonged backwards at right angles half way to the metaster- 

 num, and a short line in the suture under the hind wing, all white. And 

 the posterior declivity of the metathorax is generally tinged with rufous, 

 the rest of the thorax being black. 4. The carinas of the 1st joint of the 

 abdomen are less distinct, and fade out halfway to the tip. Joints 1-3, 

 and sometimes the base of 4, are rufous immaculate, the rest of the abdo- 

 men black. Venter basally dull rufous, terminally blackish. 5. The hind 

 femora are immaculate, and the hind tibiae have their basal A black, their 

 next I white, their next A black, gradually shading into the last A, which 

 is bright rufous. Length $ .21-25 inch. Front wing $ .19-22 inch. 



Thi-ee ? ; the % , which is unknown to me, will no doubt have 

 a white face and the first joint of the antennas white below. Re- 

 markably like tripicticrus 2, n. sp., but differs by the white spot 

 on the face, by the white lines on the sternum, and by the 1st joint 

 of the abdomen being rufous immaculate and having its carinas 

 less strongly developed. Any one of these characters might, if it 

 stood alone, be attributed to variation ; but as the three are per- 

 sistent throughout, they manifestly are of specific value. The hind 

 legs are exactly like those of tripicticrus, and the species is sepa- 

 rated from others by the same characters as tripicticrus. 



Bassus rilflcrus, n. sp.— $. — Face with a large oblong spot in the mid- 

 dle which extends to the clypeus, and the clypeus. mandibles, and palpi, 

 all yellowish-white. Clypeus semicircularly emarginate at tip. Antennae 

 £ as long as the body, brown-black, scarcely paler beneath, the 1st joint 



