220 NEUROPTERA. 
1. Tholymis citrina. (Tab. IX. figg. 9-11.) 
Tholymis citrina, Hagen, Stett. ent. Zeit. xxviii. p. 218 (1867) *; Proc. Bost. Soc. Nat. Hist. xviii. 
p- 64 (1875)?; Selys, Ann. Mus. Stor. Nat. Genova, (2) x. p. 440 (1891)*°; Kirby, Ann. & 
Mag. Nat. Hist. (6) xix. p. 599 (1897) *. 
Dimensions—Abdomen, ¢ 32-36, 2 33-35; hind wing, ¢ 37-39°5, 2 36-38 mm. 
Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith: 1 3); GuatEmaza, Gualan 
(Williamson, coll. ejusd.: 1 2); Panama? (F. Hohn [1], M. C. Z.: 1 ¢ )—CotomBia, 
Bonda in Dept. Magdalena [2¢, 19]; Ecuapor, Babahoyo (Campos, A. N.S.: 16, 
12); Braz [1 ¢](H. H. Smith, Carn. Mus. Pittsb.), Para?*, Island of Marajo 4, 
Santarem ‘, Tapajos+; West Inpies, Cuba ' 2. 
Taken in January (Gualan), May (Atoyac, Panama), July (Bonda, Cuba’), and 
August (Bonda). 
A comparison of this material with seven males and nine females of the Old-World 
T. tillarga gives the following differences between the two species, in addition to those 
previously pointed out}. 
Tillarga has but one row of cells between the short sector and the supplementary 
sector next below, citrina has two rows; on the front wings this brings about the 
difference that in tillarga the three post-triangular rows continue to the level of the 
nodus, while in citrina the three post-triangular rows increase to four rows proximal to 
the level of the nodus. One front wing of tillarga and one front wing of citrina vary 
from the characters just laid down in the direction of the other species. 
Tillarga has the sectors of the triangle on the hind wing arising from the same 
point, citrina has them separated at their origins. 
The striking external genitalia of the females are alike in both species; they have 
been briefly described on page 199 and by Hagen’, and I hope to figure these 
structures in the paper alluded to in the footnote to page 199, anted. 
MICRATHYRIA. 
Micrathyria, Kirby, Trans. Zool. Soc. Lond. xii. pp. 264, 303 (1889)’; Cat. Odon. pp. 41, 182 
(1890)?; Karsch, Berl. ent. Zeitschr. xxxiii. p. 871 (1890) °; Calvert, Trans. Amer. Ent. 
Soc. xx. p. 224 (1893)*; Proc. Calif. Acad. Sci. (2) iv. pp. 472, 588 (1895) ®; (3) Zool. i. 
p- 401 (1899) °; Needham, Bull. 47, N. Y. St. Mus. p. 507 (1901)"; Kriiger, Stett. ent. 
Zeit. 1902, p. 128°; Ris, Ent. News, xiv. p. 218 (1903) ’°. 
The characters employed to separate Micrathyria from Mesothemis by Prof. Needham 7 
and from Diplacodes by Herr Kriger ®, are not sufficiently constant to be distinctive. 
My previous comparison ° of Micrathyria and Anatya should be so modified as to 
state that the former has two or three rows between the proximal sub-basal sector and 
the hind margin. 
The typically Old-World Diplacodes differs from Micrathyria in possessing only one 
bridge-cross-vein and a wider hind prothoracic lobe. 
