292 Mr. Westwoop on Diopsis, 
The size of the anterior femora, however, is a specific and not a sexual cha- 
racter, those parts being of equal size in both kinds of individuals. 
It is worthy of remark, that in the species which have the wings unspotted, 
neither the sides of the mouth nor the extremity of the four posterior femora 
are, except in one instance, armed with spines. 
The species may be arranged in four groups: Ist, those with clear wings, 
and the face and posterior femora unarmed ; 2nd, those with an apical spot on 
the wings; 3rd, those having a subapical abbreviated fascia; and 4th, those 
with one or more entire fascize across the wings. In order, however, to place 
the typical species at the head of the genus, I shall alter the position of the 
groups as follows: 
Sectio I. Alis fasciá abbreviatá paullo ante apicem. 
Species 1. Diopsts IcHNEUMONEA. Linn. 
Tas. IX. Fig. 1. 
D. capite rufescenti, cornubus oculiferis ferrugineis, thorace nigro, spinis flavis, 
alis ante apicem macula nigra, abdomine segmentis duobus (tribus?) ul- 
timis nigris. 
Long. corp. e figuris Linnzanis, lin. 4 vel 5. 
Habitat in Africà zequinoctiali? In Mus. 
Linné, Diss. de Bigis Insect. p. 5. tab. f. 1—5. Ameen. Acad. vol. viii. p. 303. 
Fuessly, Archiv. 1. t. (6.) edit. Gale, p. 19. Gmelin, Syst. Nat. tom.i. pars v. 
p. 2829. Latreille, Hist. Nat. Gen. vol. xiv. p. 376. tab. 14. f. 6—7. Dict. 
d' Hist. Nat. xxiv. 435. tab. 112. f. 6, 7. (e citat. Fabr. et Dalm.). Gen. 
Crust. et Ins. vol.iv. p. 353, Dict. d' Hist. Nat. vol. ix. p. 477. pl. D. f. 5,6. 
Cuvier, Règne Anim. ed.1. tom. ii. p. 650. Olivier, Enc. Méth. 6.1. p.276. 
Lamarck, Anim. sans Vertebr. tom. ii. p.370. Dalman, Act. Holm. 1817. 
211. Anal. Ent. p. 3. No.1. Oken, Isis, 1820, p. 502. Wiedemann, Ausser. 
Zweifl. Ins. vol. ii. p. 557. Shaw, Gen. Zool. Ins. vol. ii. pl. 104. 
* Corpus magnitudine Formice rubre, statura Ichneumonis. Caput rufescens, 
dente utrinque ad os: extenditur hoc in duo cornua, patentia, longitudine 
thoracis, solida, neque articulata, uti antennee, ferruginea, terminata oculo 
: globoso, flexo, nigro. Adjecto juxta oculum puncto cum seta, antennae 
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