LEPIARCHA.-—LIARCHA. 385 
LEPIARCHA, gen. nov. 
Prosternum processu parvo. Coxe omnes parum distantes; metasternum inter coxas intermedias productum, 
acuminatum, subtiliter marginatum. 
The little insect for which I establish this genus cannot remain in Cryptarcha, the 
diminution in size of the prosternal process and the more approximate middle coxe 
being accompanied by other minor characters that prove the genus to be truly distinct. 
The male mandibles are elongate, slender, and equal; in those males of Cryptarcha that 
have elongate mandibles these are unequal. The elytra are ample, entirely covering 
the body, and the epipleuree are broad. ‘The palpi are small and slender, and the 
tibise, too, are slender. 
Probably the North-American Cryptarcha concinna belongs to this genus. 
1. Lepiarcha omositoides. (Tab. XII. fig. 18, ¢ .) 
Cryptarcha omositoides, Reitter, Verh. Ver. Briinn, xii. 1, p. 151°. 
Hab. Mexico (mus. Vindob.1); Guatemata, Capetillo, San Gerénimo (Champion). 
We have only received two specimens of this insect, and though I have not seen any 
individual from Mexico, I think they will prove to belong to the species Reitter 
described from there under the above name. 
We figure the male ; the female has very short mandibles. 
LIARCHA, gen. nov. 
Corpus ovale, fere levigatum. Mandibule ad apicem graciles, intus membrana grandi auctw; maris 
elongate. 
Though the curious membrane with which the mandibles are provided seems at first 
sight an amply sufficient character for this genus, yet it is not really so, as a similar 
though less highly developed membrane exists in several species of Cryptarcha, e. g. 
C. inequalis. There are, however, other characters that render the genus a perfectly 
good one—the middle of the metasternum being without any margin in front, and the 
mesosternum completely consolidated with it on one plane. The mandibles are equal, 
acuminate, and though appearing simple at the tip are really bifid, the notch being 
placed on the under surface. All the coxe are widely separated and the prosternal 
process is large. 
1. Liarcha placida, sp.n. (Tab. XII. fig. 19, 3.) 
Ovalis, sat convexa, testacea, vage fusco-nebulosa, antennarum clava fusca ; subnitida, subtiliter parce 
punctata. 
Long. 53 millim. 
Hab. Mexico, Mirador, Jalapa (Hoge), Temax in North Yucatan (Gawmer); GuatE- 
maLA, San Isidro (Champion); Costa Rica. 
BIOL. CENTR.-AMER., Coleopt., Vol. II. Pt. 1, September 1891. 3 D* 
