22 DIPTERA. 



each spot occupies less than one third of the breadth, and a little less than one half of the length of the 

 segment. (As segments 5-7 have become brownish in drying, I cannot speak about their colour positively ; 

 instead of the brown spots in the corners, they seem to have smaller ones more towards the middle of the 

 segments, the posterior portion of segment 7 is altogether brown.) Legs pale yellow ; posterior tibiae slightly 

 brownisb, with yellow spurs ; tarsi brown. Wings subbyaline, with a slight yellowish-grey tinge ; veins 

 brown ; stigma elongate, brown. 

 Length 7-8 millim. 



Hab. Costa Eica, Irazu (Rogers). A single specimen. 



N.B. — I have completed the generic description from three specimens from Porto 

 Eico (Moritz) in the Berlin Museum. The two males differ from 0. cognatus in the 

 colouring of the body : the pleura?, the metanotum, and the two hind pairs of coxae are 

 brown ; the abdomen brown, but the hind margins of segments 1-5 are yellow, the 

 yellow margin occupying about one third of the breadth of the segment. One of the 

 specimens has the two posterior pairs of femora brownish, the other not. The wings of 

 one of the specimens have a distinct brownish shade on the apex, and another around 

 the small cross-vein ; in the other specimen the wings are more unicolorous. 



The female specimen has the body altogether reddish-yellow, except the end of the 

 abdomen, which is infuscated ; apical cloud on the wings very distinct. 



I am not certain whether all these specimens belong to different species, or are 

 only varieties of the same insect. 



Fam. STRATIOMYID^I. 



SUBULA. 



Subula, Megerle, in Meig. System. Beschr. &c. ii. p. 15 (1820). 

 Xylomyia^Vrodr. Dipt. Ital. iv. p. 11 (1861). 

 Macroceromys, Bigot, Ann. Soc. Ent. Fr. 1879, p. 187. 



l. Subula elongata, sp. n., s . 



Black ; legs yellow, the tarsi infuscated towards the tip ; wings subhyaline. 

 Length 9-10 millim. 



Hab. Guatemala, Capetillo (Champion). 



The same type of structure as Subula americana (compare van der Wulp's figure 

 in Tijdschr. &c. 1867, t. 3. ff. 5-7). 



Head black, the tips of the palpi and of the proboscis paler. Antennae brown, paler 

 towards the base; bent backwards they would nearly reach the base of the wings. 

 Thorax, including the front and middle coxse, black, very little shining ; the margin of 

 the scutellum pale yellowish. Legs, including the middle coxa?, pale reddish-yellow ; 

 front and middle tarsi infuscated, except at the base ; hind tarsi brown from the tip of the 

 first joint. Hal teres brownish. Wings subhyaline, with a slight pale brownish tinge, 

 especially on the distal half; stigma only a little darker ; veins brown ; venation like 



