a new Genus of Infedts. 199 
logift who has drawn out natural charaéters for infeéts(m). 'To point 
out at firft thofe circumftances in which all the individuals of a 
genus agree, is certainly extremely ufeful, and {pares much unne- 
ceffary tautology when we come to defcribe them. I fhall there- 
fore follow his example upon the prefent occafion. 
AMMOPHILA. 
Sandwafp. 
CHARACTER NATURALIS. 
Caput fuborbiculatum, fubdepreffum. Ro/frum corneum, inflex=- 
um, fubulato-conicum(z), vagind trivalvi; valvulis duabus 
fuperioribus (0) femifagittatis medio palpigeris, palpis fex- 
articulatis ; inferiori (p) apice biariftata (7), ari/fis membra- 
naceis; palpis duobus quadriarticulatis inftruéta (r); dns 
guam fubmembranaceam, retraétilem, tubulofam, fubclava- 
tam, clavd bifidd, exerens (s). Labium inflexum. Mazxille 
forcipate minaces, apice tridentate, dente interiori minimo, . 
intermedio magno truncato, exteriore maximo acuminato (). 
Antenne filiformes, thorace breviores, fepiis tredecim arti-- 
culorum(z), medio frontis inferte(v). Oculi ovales, dif-- 
_tantes. Stemmata in triangulum difpofita. 
-(m) Ego primus,.in Entomologia, characteres naturales compofui, introduxi, quibuss 
omne fyftema nitidebet. Fabric. Philof: Entomol. Hamburg. 1778, VI. § 28. 
(n) Tab. XIX. No. IL. fig. 4. a. (2) fig. 1-. (p) fig. 2. c. 
(g) fig. 2. dd. (r) fig. 2. ©. (s) fig. 2. £. and fig. 3. (2) fig. 5: 
(wu) The three firft joints of the antennz differ in form from the reft—Thefirft, or u/s, . 
is fcarcely vifible without a magnifier, the fecond. is very large, andthe third very {mall.- 
In one fpecies they confift.of fourteen joints, 
(v) fig. 6. 
‘ 
Gillam : 
