89- 



Tlie other moutli-parts may be briefly de.scribed as follows : 

 the enormous, vaulted clypeus bears a short, broad labrum, 

 the rim of which is bent over inwards, and bears two hooks 

 pointing obliquely inwards, and separated by a distance equal 

 to about one third of the breadth of the labrum. In a state of 

 rest, the two lobes of the labrum fit in between these hooks, 

 while the labial palpi fit in just outside of them on either side, 

 thus closing the mouth completely. 



The mandibles are very strong, triangular, the cutting edge 

 sharp, concave, toothed, above expanding into a broad molar 

 surface with fine transverse ribs. The labium is small, its 

 outer border with rounded off angles and extending into two 

 trowel-shaped lobes. The labial palpi are one-jointed, and 

 club-shaped, reaching nearly half of their length beyond the 

 lobes of the labium. 



Lying beneath the labium can be seen two yellowish organs 

 with a leaf-shaped outline, connected by two ducts which unite 

 into one, the latter leading into a horse-shoe shaped chitinous 

 bone, situated just below the opening of the oesophagus ; these 

 organs I take for salivary glands. 



The eyes of Atropos consist of a group of seven simple 

 ocelli, six of them round and arranged in two longitudinal 

 rows, three above and three below, breaking joints with each 

 other, the upper row being slightly in advance ; behind and 

 above the upper row is the seventh ocellus, which is long oval 

 in shape. 



The antennae consist of two stout basal joints, the second 

 the longer ; and a flagellum of thirteen long, slender, cylindrical 

 joints, which show, under a liigh magnifying power, a delicate 

 transverse striation. Edward Burgess. 



A Plague of Horse-fltes. Mr. S. H. Scuddeu said that be- 

 tween Alkali Station and Green River, in Colorado, is a very alkaline 

 meadow whicli was so infested with Tabanus and Stonioxys that during a 

 rapid walk of one and a half kilometres past this meadow, swinging his net 

 before him, he caught 239 Tabanus of one species, 28 Stonioxys and a i^vf 

 other flies. The flies began to attack liim when he had approached within 

 about five kilometres of the meadow. Not a single Orthopteron was found 

 in the meadow, although search was made. {Oct. 12, ]877.) 



