318 APPENDIX. 



gularly curved line, pale yellow; labrum nearly orbicu- 

 lar, and with the mandihles pale yellow, the latter pice- 

 ous at tip ; stethidium and abdomen black, immaculate ; 

 wings with fuscous nervures, stigmata, and costal edge ; 

 feet pale rufous; posterior tarsi and their tibiae at tip 

 blackish. 



Length of the body half an inch. 



4. T. terminalis. Antennae white at tip ; abdomen tes- 

 taceous. 



Inhabits United States. 



$ Body black ; head testaceous ; vertex with a blackish 

 longitudinal vitta ; antennse black, four last joints white ; 

 stethidium black ; thorax with a piceous triangle before, 

 and a large yellow spot behind ; thorax with two small 

 yellow spots; ivings tinged with fuliginous; nervures fus- 

 cous; carpal spot whitish on the basal half; pleura with a 

 large testaceous spot beneath the superior wings ; feet tes- 

 taceous, coxae black, tip of the posterior coxae white ; ab- 

 domen entirely testaceous. 



^ Tip of the antennae pale yellowish ; superior orbits 

 with a white sagittate spot ; occiput each side with a white 

 spot ; instead of the piceous triangle of the thorax is a 

 white V-like spot; pleura testaceous; pectus testaceous, 

 disk and posterior coxae at base black. 



Length seven-twentieths of an inch. 



The white terminal joints of the antennas of this species 

 are very distinct and striking. 



5. T. pygmsea. Black ; thorax rufous before ; feet white. 

 Inhabits United States. 



% 9 Body polished ; hypostoma obscure whitish ; tJw- 

 rax, anterior segment rufous, collar dusky ; wings dusky ; 

 feet white; thighs blackish in the middle behind; poste- 

 rior tibiae and tarsi black. 



Length % one fifth of an inch, 9 rather more. 



