LAMPYllIDAE. 203 



fine elevated lines forming a coarse network, or more usually a 

 regularly goffered surface. The bead is sometimes prolonged in 

 front of the eyes into a long narrow beak, which in other species 

 becomes broad and short and in many of the species entirely dis- 

 appears. The mandibles are feeble, slender, and acute, the palpi 

 are unequal and the eyes larger iu the % than 9, though never 

 very large; they are widely separated above and beneath. The 

 anteuuffi are eleven-jointed, but the second joint is sometimes 

 very short and inconspicuous ; they are frequently very broad 

 and compressed, and the joints 3-10 occasionally emit broad 

 l)ranches, more slender and longer in the l than in the 9; fre- 

 quently too, they are only slightly compressed and subserrate; in 

 this case the second joint is very distinct and one-half as long as 

 the third. The sexual characters are simple ; the ventral seg- 

 ments are seven in the 9, the seventh being large and slightly 

 nicked at the tip; they are eight in the %, the seventh being 

 broadly and strongly emarginate, and the eighth elongate-oval, 

 moderate in size and prominent. There are slight differences in 

 the form of the last two segments of % in our species, but as they 

 are readily recognized by other characters we have not deemed 

 it prudent to encumber tlie tables with minutioB of such small 

 import which would probably tend to confuse the student. 



The genera represented in our fauna may be divided into three 

 natural groups: the first is typical and peculiar, the second tends 

 to the Lampyrinae, and the third to the Telephorina3. 

 Prothoracic spii'acle not prominent. 2. 



Prothoracic spiracle with tubular cliitinoiis peritreme, very prominent in 

 the usual position of the epimeron, behind and at the outer extremity 

 of the front coxse (except in Cmiia). Lvci. 



2. Elytra costate, cancellate or reticulate. Ekotes. 



Elytra substriate, not costate or cancellate. Lygistopteri. 



Group I. — Lyci. 

 Front prolonged, beak more or less distinct, month anterior. 2. 



Front gibbous between the anteniue, mouth deflexed, inferior, beak want- 

 ing. 4. 



2. Beak long. 3. 

 Beak short. Rhyncheros. 



3. Antennae with tliird joint as long as fourth and fifth. Lycus. 

 Antennae with third joint scarcely longer than fourth. Lycostomus. 



4. Antennae much compressed. Calopteron. 

 Antennae pectinate ; spiracle prominent. Celetes. 

 Antennae pectinate ; spiracle not prominent. Caenia. 



