214 DIPTEBA. 



Beyond the usual pile, there are no conspicuous fringes or other secondary sexual 

 characters on the legs. 



2. Dolichopus ?,<?$. 



Eab. Mexico, Ciudad in Durango 8100 feet (Forrer). 



Of the group of J), ramifer, Loew, D. Ufractus, Loew, &c. Two specimens in poor 

 condition ; these have the third joint of the antennae elongate, black ; the wings dis- 

 tinctly infuscate between the distal part of the anterior margin and the fourth vein. 



PSILOPUS. 



Psilopus, Meigen, System. Beschr. der bek. europ. zweifl. Ins. iv. p. 35 (1824) *. 



Of this genus, very abundantly represented in tropical regions, the collections before 

 me contain about half a dozen species. Owing to the difficulty of denning the species 

 of this group and the very large number (between 80 and 90) already described from 

 North and South America, I do not attempt either to determine or to describe this 

 small collection ; the whole group requires a monographic treatment. 



The species of Dolichopodidse hitherto described from Mexico and Central America 

 are as follows : — 



Psilopus dimidiatus, Loew, Monogr. &c. ii. p. 246. — Mexico (S. America, 

 Schiner, Reise d. Novara, Zool. iii. Abth. i. p. 212). 



melampus, Loew, 1. c. p. 253.— Mexico (S. America, Schiner, 1. a). 



incisuralis, Macq. Dipt. Exot. Suppl. i. p. 120, t. 20. f. 6.— Mexico, 



• Yucatan. 



lepidus, Walk. Dipt. Saund. p. 207. — Mexico. 



peractus, Walk. Trans. Ent. Soc. Lond. n. ser. v. p. 287. — Mexico. 



permodicus, Walk. 1. c. p. 288. — Mexico. 



solidus, Walk. 1. c. p. 287. — Mexico. 



hcereticus, Walk. 1. c. p. 287. — Mexico. 



Hydrophorus punctipennis, Say, Proc. Ac. Phil. vi. p. 170 ; Compl. Wr ii. 

 p. 362 (Medeterus). — Mexico. 



Lyroneurus ccerulescens, Loew, Monogr. &c. ii. p. 170. Mexico. 



Tarn. EMPIRE. 



EMPIS. 



Empis, Linnaeus, Syst. Nat. ed. 12, i. pt. 2, p. 1003 (1767). 



* This name is preoccupied iu Mollusca (1795) j I do not think it necessary, however, to change it. 



