414 PROCEEDI^'GH OF THE XATJOyAL MUSEUM. vol.43. 



TERMINOLOGY USED IN PAPER. 



Anal protuberance. An organ in the male which projects beyond the genitalia, and is 

 generally furnished at its lateral extremities with two long, curved, pubescent 

 bristles. 



Antenna. This consists of three joints. The third joint is practically all that is visible 

 to anything except the higher magnification lenses, and is the only one which is 

 referred to in descriptions. 



Costa. That part of wing bordered by the thick costal vein, extending to from one- 

 third to two-thirds of the wing length in different species, and more or less combed 

 with thick-set bristles or hairs. 



Costal divisions. The first division is taken as extending from the humeral cross vein 

 to the junction of the first vein with the costa. The second is taken as from the 

 farther side of the first A-ein to the near side of the fork, or the tip of third vein as 

 the case may be . When the term ' ' remainder ' ' is used as against the length of first 

 diA-ision both second and third are included as one. The third is that inclosed by 

 fork of third vein and tip of same. 



Fork of third rein. This is really the second vein, which is coalescent with the third 

 to near its junction with the costa. 



Frons. That portion of head bordered by the compound eyes laterally, the face in 

 front Cwhich is hidden by the very large antennae and is more or less invisible 

 except from directly in front), and the occiput behind. 



Frontal bristles. These are transversely four-rowed in Phora and Aphiochseta as well 

 as some of the other genera. The first row consists of two or four bristles situated 

 on the center of frons directly over the antennae and are. in some genera reclinate, 

 i. e., lying back over the frons as the other bristles do, or proclinate, i. e., project- 

 ing over the antennae and downward, or erect, i.e., projecting straight out over 

 the antennae. Those bristles are in my opinion but one row, and in some cases we 

 find them more or less in line. The second row consists of four bristles which are, 

 when the frons is elongated, sometimes much out of line, and the central pair drops 

 farther down and nearer the eye margin the longer the frons is. The third row is 

 situated more or less closely to the anterior ocellus and consists of four bristles. 

 The fourth row consists of four bristles situated, two on the ocellar triangle and one 

 on near each eye margin. There are in most species two other bristles situated on 

 the back of the vertex and directed inward toward the ocelli, but little account 

 is taken of them in descriptions of species. In descriptions in Aphiochasta the 

 first row is called the post-antennal and the second row is called the first row — 

 i.e., of reclinate bristles. 



Frontal suture. A suture or depression more or less distinct in Aphiochxta that runs 

 from front ocellus to front edge of frons. 



Hind tibial armature in Aphiochsrta. The hind tibia has a raised ridge running from 

 base to tip on the dorsal surface, which is generally clothed with "\ery short hairs. 

 Those hairs in the .'•pecies with yellow legs give the insects the appearance of 

 haA-ing a black dorsal line, and some writers refer to these as having the ' ' tibiae black- 

 lined above." The great majority of the species have a single row of serial bristles 

 on the postero-dorsal surface just below the dorsal ridge, but in some this is dupli- 

 cated more or less fully on the antero-dorsal surface. 



Leg surfaces. These are arrived at bj- taking the legs as at right angles to the body, 

 and considering the upper surface as the dorsal and the under as the ventral. 



Mesopleural bristles. These are situated on the mesopleura, on the upper posterior 

 angle close in front of wing base, and are in the black species very difficult to 

 detect. 



