DIOGMITES. 177 



coarctate at the suture between the second and third segments ; the segments do not 

 have any distinct hind margin of a lighter colour (though, when the specimen is looked 

 at with the end of the abdomen towards the light, a golden reflection is visible along 

 the margins), and appear to be only slightly darker brown on the disc. The grey 

 shadow on the wings does not occupy the proximal ends of the second submarginal and 

 the second and third posterior cells ; the triangle in the fourth posterior cell sometimes 

 coalesces with the shadow in the third posterior cell, sometimes it is separated from it 

 by a hyaline interval along the intervening vein ; there is a grey triangle in the discal 

 cell, and grey shadows in the anal and axillary cells : all these shadows vary in extent 

 in different specimens. The reddish anterior end of the dorso-central stripe seems to 

 be characteristic. 



N.B. — I have before me two Mexican specimens which Prof. Bellardi allowed me to 

 take from among his duplicates ; these have the short appressed hair on the abdomen 

 black. Three examples from Costa Eica, Cache (Bogers), have this pubescence " golden- 

 yellow " ; the shadows of the wings darker, although their distribution is the same ; 

 and the brown stripe &c. on the hind femora &c. very dark. Do the latter belong to 

 the same species % 



Two specimens from Mexico, Presidio (Forrer), are like the preceding, only the discs 

 of the abdominal segments are much darker, thus almost leaving a lighter border along 

 the hind margins. Do these specimens belong to a different species 1 



D. misellus, Loew, Centur. vii. no. 39 (United States), must be very like D. rubescens ; 

 it has the middle thoracic stripe in front, and the palpi, reddish ; and the anal cell is 

 described as having no shadow within it (in D. rubescens the shadow is very small). 



That D. misellus is the same as D. winthemi, Wiedem., as Dr. Williston thinks (Tr. 

 Am. Ent. Soc. xi. p. 24), may be true, but requires further proof. The comparison with 

 a type specimen, unless undertaken by some one who has made the genus a special 

 study, is not convincing. In fact, it is doubtful whether Wiedemann himself had suffi- 

 ciently specialized his species to be aware of its characteristics ; his description is too 

 short, and would apply to many Diogmites. 



7. Diogmites jalapensis. 



Dasypogon (Saropogon) jalapensis, Bellardi, Saggio &c. ii. p. 65, 1. 1. f. 5\ 

 Hab. Mexico, Jalapa (Truqui l ). 



I have before me a duplicate specimen kindly given to me by Prof. Bellardi. It 

 principally differs from J), rubescens by its smaller size, 12 to 13 millim., by its dorso- 

 central thoracic stripe not being reddish in front, and by its black palpi ; the hind femora 

 have no trace of a darker stripe — they are reddish-yellow, black at the tip ; the abdo- 

 minal segments are brownish in the middle, their margins being more yellowish ; and 



biol. centk.-amer., Dipt., March 1887. 2 a 



