100 DIPTEKA. 



that in such Argyramoebce the intensity of the black on the wings is rather uniform, 

 while in the species of Anthrax of a similar pattern the black on the antero-proximal 

 half of the wing is more or less spotted with paler shades on the cross-veins. The 

 wings of the European A. hetrusca are altogether without black spots. The great 

 resemblance between Argyramoebce from distant parts of the world is remarkable. 



The larvae of Argyramwba, as far as known, prey upon the brood in the nests of 

 Hymenoptera (cf. ' Western Diptera,' p. 243). Schiner's statement (' Fauna,' i. p. 52) 

 that they are parasites in the pupae of Lepidoptera is erroneous. In the ' Western 

 Diptera' I have given a tabular arrangement of the species from the United States. 

 The species mentioned below may be tabulated as follows : — 



Third posterior cell bisected by a cross-vein 1. simson, Fabr. (?). 



Third posterior cell not bisected. 



Antero-proximal portion of the wings uniformly deep black, 



the postero-distal portion hyaline 2. acroleuca, Wiedem. 



3. sp. ? 



4. analis, Say (?) . 

 Antero-proximal portion of the wings not uniformly deep 



black, nor the postero-distal portion uniformly hyaline. 



Costal cell checkered with black and hyaline .... 5. oedipus, Fabr. 

 Costal cell not checkered. 



A stump of a vein on each of the two sinuosities of 

 the anterior branch of the third vein .... 6. pluto, Wiedem. 



7. seriepunctata, sp. n. 

 A stump of a vein on the proximal sinuosity only, 



or no stump at all 8. daphne, sp. n. 



9. fur, O. S. 



l. Argyramoeba simson. 



Anthrax simson (Fabr.), Wiedem. Aussereur. zweifl. Ins. i. p. 259, t. 3. f. 2; Macq. Dipt. Exot. ii. 



1, p. 59, t. 16. f. 2. 

 Anthrax scripta, Say, Compl. Wr. ii. p. 59. 

 Nemotelus tigrinus, de Geer, vi. t. 29. f. 11 [teste Wiedem.]. 



Eab. United States. — Mexico (?). — Colombia (teste Schiner, Eeise d. Novara, Zool. 

 iii. Abth. i. p. 120). 



I refer to this species, but with a doubt, two specimens from Jalapa, Mexico (Edge), 

 and two others, in Prof. Bellardi's collection, from Mexico (Salle). They are smaller 

 than the average specimens from the United States ; the pattern of the wings differs in 

 having the vein separating the discal cell from the third posterior cell not clouded with 

 brown, except at both ends ; the same is the case with the portions of the fourth vein 

 separating the discal and the second posterior cells from the first posterior ; they are 

 not clouded, except at both ends. Is it a different species \ The imperfect preservation 

 of the bodies does not allow a close comparison. 



