1894.] 27 



Pericoma, and Psychoda. Italics a to e denote each a particular detail. 

 The numerals prefixed in the tabulations to the names of the species 

 of Pericoma and Psyclioda are used in the Plates to denote the illus- 

 trations that concern the same species. 



PLATE I. 

 U. and P. — Ulomyia fuliginosa (Yol. iv, p. 82, step 4) and species of the 1st Section 

 of Fericoma (Vol. iv, p. 120) : — 1, palustris ; 2, mutua ; 3, cognala ; 4, 

 compta ; 5, extricata ; 6, nubila ; 7, trivialis. 



Wings of U,, (7 and $ , and P. Nos. 1 to 5. 



a — Superior genital appendage, S , of U. and P. JSTos. 2 and 4 to 7. 

 J — Inferior genital appendage and forceps basis, <? , of P. No. 7. 

 c. — External genitalia, ? , from the side, of P. No. 7. 



PLATE II. 



P.— Species of the 2nd Section of Pericoma (Vol. iv, p. 122) and of part of the 3rd 

 Section (Vol. 4, p. 123) :— [2nd Section], 8, neglecta; 9, canescens ; 10, 

 exquisita; 11, fallax ; 12, gracilis ; 13, blandula ; 14, frifasciata ; 15, 

 pulchra ; [3rd Section], 16, ocellaris ; 17, Dalii ; 18, notabilis ; 19, 

 ambigua. 



Wings of P. Nos. 9 to 14 and 16 to 19 ; the dotted part in No. 17 supplied from a 

 nearly related foreign species. 



a — Superior genital appendage, (?, of P. Nos. 8 to 11 and 13 to 16. 



&— Antenna of P. Nos. 16 <? , 16 ? part, and 18 <? . 



PLATE III. 



P. — Species of the remainder of the 3rd Section of Fericoma (Vol. iv, p. 123) and 

 species of the 4th Section (Vol. iv, p. 127) : — [3rd Section continued], 20, 

 decipiens ; 21, soleata ; 22, consors ; 23, labeculosa ; 24, advena ; 25, 

 morula ; [4th Section], 26,fratercula ; 27, ustulata ; 28, oaliginosa ; 29, 

 incerta ; 80, revisenda. 



Wings of P. Nos. 20 to 30. Two figures are given of No. 21 to illustrate individual 

 variation in extremities of basal cells. 



a — Superior genital appendage, J , of P. No. 27. 



PLATE IV. 

 P. — The species of the 5th Section of Pericoma (Vol. iv, p. 33, step 5) ■.—^l,fiisca. 



Ps. — Species of the Ist Section of Psyclioda (Vol. iv, p. 129) and of the 2nd Section 

 (p. 33, steps 6a and 7): — [1st Section],!, lucifuga; 2, phalcenoides ; 8, 

 albipennis ; 4, sexpunctata ; 5, erminea ; [2iad Section'], 6, Immeralis. 



Wings of P. No. 31, S and ? , and of Ps. Nos. 1, 2, 3 and 6. The thinness of the 

 neuration in Nos. 1 and 2 may be due to the direction of the light when 

 they were drawn. Two figures of No. 3 are given to illustrate individual 



