COLEOPTERA. 71 
which the eyes are remote from each other, and the thorax is almost 
orbicular and transversal, form the genus 
Pyrocuroa, properly so called*. 
In the third tribe, that of the MorpELLon#, so far as respects the 
form of the joints of the tarsi and of their hooks, and of that of the 
antenne and palpi, we find no common and constant character. 
These Insects, however, are easily distinguished from other Hetero- 
mera of the same family, by the general conformation of their body, 
which is elevated and arcuated; the head is low, the thorax trape- 
zoidal or semicircular, and the elytra are very short or narrowed, and 
terminate in a point, like the abdomen. Several of these Insects 
approach the Pyrochroides in their antenne; others, by their max- 
ille, the hooks of their tarsi and parasitical habits, approximate to 
Nemognathus and Sitaris, subgenera of the last tribe of this family; 
but they are removed both from the former and the latter by their 
extreme agility and the firm and solid nature of their teguments. 
They form the genus 
Morpe.ta, Lin. 
In some, the palpi are almost of equal thickness throughout. The 
antenne of the males are strongly pectinated, or flabelliform. The 
extremity of the mandibles is unemarginated. The joints of the tarsi 
are always entire, and the hooks of the last one are dentated or bifid. 
The middle of the posterior margin of the thorax is always strongly 
prolonged backwards, and simulates a scutellum. ‘The eyes are not 
emarginated. The larve of some of these Insects—Azpiphori—inha- 
bit the nests of certain Wasps. 
Rirrevorus, Bosc. Fab. 
Their wings are extended, reaching beyond the elytra, which are 
the length of the abdomen; the hooks of the tarsi are bifid; the an- 
tennze, inserted near the inner edge of the eyes, are pectinated on 
both sides in the males, serrated, or with but a single range of short 
teeth in the females. The terminal lobe of the maxillee is very long, 
linear, and salient, and the ligula equally elongated and strongly bifid. 
Certain naturalists have found several living specimens of the 
Ripiphorus paradoaus in the nests of the Common Wasp, which led 
to the opinion, that they had lived there in their larvee state. Ac- 
cording to an observation of M. Farines, however, communicated to 
Count Dejean—Ann. des Sc. Nat., VIII, 244—the larva of the &. 
the collection of M. Bosc, that closely approximates to the Pyrochroa flabellata, Fab. 
M. Fischer has made the same generic section, under the denomination of Pogono- 
cerus, from a second species—thoracieus—discovered in southern Russia. The figure 
of it, given by him in the Mem. of the Nat. of Mosc., is reproduced in the first 
volume of his Entomog. Imp. Russ. 
* See Geoffroy, De Geer, Fabricius, Latreille, Scheenherr, &c. 
