MACROBASIS. 401 
the inner side before the tip; the second joint is quite slender, and one-half longer than 
the third. I. tenuicornis approaches M. tenuis and M. diversicornis, but differs from 
both in the form of the male antenna. J. unicolor (Kirby) has two spurs to the male 
anterior tibia, and I. immaculata (Say) a very much shorter basal joint to the male 
antenna. J. tenuicornis agrees very nearly in its male characters with M. humeralis, 
Dugés; but there are considerable discrepancies in colour and other particulars, and it 
cannot be satisfactorily identified with that species. 
12. Macrobasis ochrea. (Tab. XVIII. figg. 23, ¢; 23a, antenna, ¢ .) 
Lytta ochrea, Lec. Proc. Acad. Phil. vi. p. 342 (1853) *. 
Macrobasis ochrea, Horn, Proc. Am. Phil. Soc. xiii. p. 91 (1873)?; Trans. Am. Ent. Soe. xii. p. 110°. 
Cantharis protarsalis, Dugés, La Naturaleza, iv. p. 63, t. 2. figg. 7, 7 a-h (g), 8a-c (¢?)*. 
Macrobasis protarsalis, Dugés, An. Mus. Michoacano, ii. p. 53°. 
Hab. Norta America, Texas! 2.—MeExico, Northern Sonora (Morrison), Guanajuato 
(Santander + °). 
We have received numerous examples of both sexes of this species from Sonora. 
Leconte’s description ! (and apparently Dr. Horn’s also?) was made from a single male 
example of unusually large size and somewhat pallid colour. Dugés describes and 
figures both sexes4, from specimens found in a house at Guanajuato. I. ochrea 
differs from all its allies in the short antenne, joints 2-11 being obconic, and 2 a little 
shorter than 8. In the male the basal joint of the antenne is nearly one-third of their 
entire length, the first joint of the anterior tarsi is broad, concave above, very much 
shorter than the second, and obliquely produced within, and the last ventral segment 
is emarginate. The elytra are uniformly testaceous; the head and thorax vary in 
colour from piceous to testaceous. This species might equally well be placed in 
Epicauta, the second antennal joint being slightly shorter than the third in both sexes. 
13. Macrobasis segmentata. (Tab. XVIII. figg. 22,3; 22a, antenna.) 
Lytta segmenta, Say, Journ. Acad. Phil. iii. p. 303 (1824)*; Complete Writings, ii. p. 169°. 
Lytta segmentata, Lec. Proc. Acad. Phil. vi. p. 842 (1858) ’. 
Macrobasis segmentata, Horn, Proc. Am. Phil. Soc. xiii. p. 93*; Trans. Am. Ent. Soc. xii. p. 110’. 
Lytta valida, Lec. Journ. Acad. Phil. iv. p. 89 (1858) °. 
Macrobasis cinctothoraz, Dugés, An. Mus. Michoacano, ii. p. 56’. 
Hab. Nortu America! 3, Kansas4 to Texas? 4° and Arizona *.—MExico, Santa Clara 
in Chihuahua, Villa Lerdo in Durango (Hége), Chihuahua (Hodge). 
Dr. Horn remarks* that the wings in this species are usually very small and 
rudimentary, and that specimens occasionally occur in which they are fully developed. 
The six examples, including both sexes, received by us from Mexico all have fully- 
developed wings. A large black species, the thorax with a fringe of cinereous hair 
along the base and apex, the rest of the pubescence of the upper surface (and that 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 2, September 1892. 3 FF 
g 
