274 HETEROMERA. 
convex, the first prolonged at the apex into a pointed tooth, the fifth and seventh united 
near the apex and together forming a second tocth, longer than the other and curved 
within. It is stated to be nearest allied to, and possibly the female of, H. allardz, and 
also to be of the general form of H. filibuster. 
13. Hegemona mexicanus. 
Bronze-black, with a slight bluish tint, rather dull, the elytra shining. Head very minutely and indistinctly 
punctured, narrowly transversely excavate anteriorly, the groove separating the epistoma deeply impressed 
behind, shallowly so at the sides; prothorax fully as long as broad in the male, a little shorter in the 
female, narrowing very gradually from the base, the sides almost straight, the hind angles rather obtuse, 
the anterior angles strongly produced in front and narrowly rounded, the surface finely, shallowly, and not 
very closely punctured ; elytra more shining than the prothorax, of a very dark bluish-bronze colour, 
moderately long, more or less grooved within at the base, rather wider than the prothorax, but little 
rounded at the sides, subparallel, strongly gibbous, laterally compressed, with rows of more or less longi- 
tudinal, exceedingly coarse impressions placed upon narrow strie (the punctures coarser towards the suture 
and frequently confluent), the interstices rather narrow, smooth, somewhat strongly convex, and here and 
there confluent on the disc, flatter, broader, and more regular at the sides, the fifth sometimes slightly raised 
posteriorly ; beneath more shining, smooth; prosternum horizontal, strongly acuminately produced, 
slightly excavate within between the coxa, its anterior face also excavate. 
Length 163-20 millim. ; breadth 63-9 millim. (¢ 2.) 
Hab. Mexico (coll. Brit. Mus., ¢ 2), Chinantla (Saldé). 
Three examples. The description is taken from the male example in the National 
Collection, the female specimen in the same collection and the individual from Chinantla 
(possibly a small female) being in a more or less mutilated condition ; in the latter the 
elytra are strongly and almost uninterruptedly grooved within at the base. 
14. Hegemona guatemalensis. (Tab. XI. fig. 25, 2.) 
Dark bronze, with a slight bluish tint, slightly shining. Head shining, very finely and shallowly punctured, 
narrowly transversely excavate anteriorly, the groove separating the epistoma deeply impressed behind, 
shallowly so at the sides; prothorax broader than long, very gradually narrowing from the base, the sides, 
slightly rounded, the hind angles rather obtuse, the anterior angles somewhat produced in front and rather 
broadly rounded, the surface very finely, closely, and distinctly punctured; elytra rather more 
shining and a little wider than the prothorax, of a brighter, almost bluish, bronze-colour, the base not 
margined within, moderately long, very little compressed at the sides, strongly gibbose ovate, almost - 
regularly convex, with rows of coarse longitudinal impressions placed upon rather shallow strie (the punc- 
tures here and there confluent, the parts of the strise between the impressions on the disc very shallow and 
scarcely below the level of the interstices), the interstices broad, convex towards the sides, feebly so on the 
disc, very minutely and sparingly punctured, the second to the ninth in the female confluent a little before 
the apex and together (in a line with the fifth) forming a large rounded lateral protuberance; beneath 
black, shining, smooth; prosternum horizontal, strongly acuminately produced, slightly excavate within 
between the coxa, its anterior face also excavate. 
Length 18 millim.; breadth 8 millim. ( 9.) 
Hab. GuatTema.a (coll. Stuttgart Museum). 
One example. This insect is closely allied to H. mexicanus; the female, however, 
differs from the same sex of that species in having the prothorax shorter and broader, 
with the anterior angles less prominent and more broadly rounded ; the head more 
