1S92.] ' I 



is figured and described by Curtis, in liis British Entomology. He found it in the 

 Isle of Arran, as well as in the south of England. It is also in the Rev. E. N. 

 Bloineficld's and Mr. Dale's collections. 



M. coNTCA, Fin. 



This small species (about 4 mm. long) is more slender in shape than the former, 

 from which it also differs by having two moderate-sized vibrissfc, and narrower 

 frontalia, as well as good-sized seta; on the edges of the abdominal segments. The 

 colour is grey, the frontal sfripe is yellow ; the face white, with grey reflections ; 

 the antenna; brown, the palpi nigrescent, the arista slightly pubescent ; the thorax 

 is pale grey, indistinctly striped ; the abdomen yellowish-grey, marked with three 

 spots on the first, second, and third segments, the middle spots being often indistniet; 

 the wings have the apical cross veins curved, with a cubital appendix, and the outer 

 cross vein sinuous ; the legs are black, witli the fore tarsi of the males furinshed 

 with long claws and hairs. Very rare. 



25.-TRIXA, Mgn. 



Gen c/i.— Eyes nude, approximated in the male, and widely se- 

 parated in the female ; fronto-orbital bristles in a double row in both 

 sexes, and only extending to the base of the antenna? ; antennae very 

 short, the second and third joints nearly equal in length, the latter 

 with rounded extremities ; arista subpubescent ; cheeks bare ; facialia 

 ciliated on their lower halves ; chin large and hairy ; palpi large, and 

 with the ends clavate in the females ; abdomen with both marginal 

 and discal setae ; wings with a short but true cubital appendix. 



The species of this well-marked genus are difficult to determine, 

 and several of those described by Meigen and others appear to be 

 only varieties. The wing veins are usually more or less clouded 

 with black, particularly the inner cross veins, but this character is 

 very variable in different individuals of the same species ; the legs 

 are also always more or less ferruginous, but the femora are often 

 nigrescent, especially upon their upper surface;^. 



1 (2) Legs with femora nigrescent, and with wing veins clouded... 



1. wstruidca, ])sv. 



2 (1) Legs wholly ferruginous, and wing veins uneloudctl. 



3 (4) Scutellum nigrescent 2. alpina, Mgn. 



4 (3) Scutellum ferruginous 3. scutellata, 'Newman. 



T. CESTROIDEA, DsV. 



variegata ?, Mgn. 



dorsalis ?, Mgn. 

 Head : sides of frontalia black (very narrow in the male), with white reflections ; 

 face vihite, crossed by black erescentic iiatches ; antenna; and palpi rufous, the latter 

 clothed with white tomentum on the apices ; thoi'ax grey, marked by three broad 



