66 HETEROMERA. 
MICROSCHATIA. 
Microschatia, Solier, Ann. Soc. Ent. Fr. 1836, p. 474, t. 11. f. 19-22; Lec. Ann. Lyc. New York, v. 
p. 129; Lac. Gen. Col. v. p. 157 (1859) ; Lec. Class. Col. N. A. part 1, p. 221 (1862); Horn, 
Rev. Ten. N. A. p. 281 (1870); Lec. & Horn, loc. cit. 1883, p. 369. 
Three species from North America and one from Mexico constitute this genus. 
1. Microschatia punctata. 
Microschatia punctata, Sol. loc. cit. p. 475, t. 11. £. 22°. 
- Hab. Mexico! (Sallé, coll. F. Bates). 
ASTROTUS. 
Astrotus, Leconte, Journ. Ac. Phil. iv. p. 19 (1858) ; Class. Col. N. A. p. 221 (1862) ; Horn, Revis. 
Ten. N. A. p. 290 (1870). 
Two species of this genus have been described from Texas; three others are now 
added from Mexico. 
1. Astrotus debilis. (Tab. IT. fig. 22.) 
Oblong oval, depressed above, dull black, densely clothed with earth-like scales, slightly pubescent. Head with 
the lateral margins of the front swollen and rounded; prothorax broader than long, the sides rounded, 
much narrowed behind, and sinuate before the slightly prominent subrectangular hind angles, slightly 
narrowed in front, and the anterior angles a little produced and prominent, base truncate, the surface 
with fine raised points, closer and more distinct along each side of a central groove and on the lateral 
margins; elytra flattened, a little narrower than the thorax at the base, narrowed and slightly emarginate 
at the shoulders, widening gradually to beyond the middle, then suddenly narrowed, and the apex produced 
and rounded, humeral angles obtuse, the base truncate, with a slightly prominent marginal ridge, curving 
inwards before the apex, and a few short, oblique, or sinuous elevations. 
Length 6-9 millim. 
Hab. Mexico (Sallé), Tehuacan (Hoge). 
Six examples. 
2. Astrotus limosus. (Tab. II. fig. 21.) 
Oblong oval, slightly convex, black, densely clothed with earth-like scales. Head transversely impressed 
between the eyes; prothorax broader than long, narrowed in front and behind, sides rounded, hind angles 
rectangular, base truncate, anterior and lateral margins slightly reflexed and swollen, disc with a few 
scattered almost obsolete flattened sinuous elevations; elytra widest a little beyond the middle, base 
truncate, fitting closely to and as wide as the thorax, with three (two dorsal and one marginal) serrated 
ridges—the marginal starting from the shoulder and turning off obliquely before the apex to meet the 
first dorsal, which starts from near the base, midway between these and parallel with them is another 
shorter ridge not reaching the base, nor confluent with the others behind, the two dorsal ridges connected 
a little behind the middle by a short transverse elevation. 
Length 7 millim. 
Hab, Mexico (Sallé). 
One example. Allied to A. debdilis, but more convex, with the thorax less narrowed 
behind, the elytra not suddenly narrowed at the base, &c. 
