72 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser.. 



Neurigona Rondani. 



Saucropus LoEW. 



1. Abdomen, at least near the base, with black or metallic fasciae 2 

 Abdomen without fasciae .Jloridula, sp. nov. 



2. Thoracic dorsum, at least anteriorly, yellow 3 



Thoracic dorsum metallic green 6 



3. Face protruding below signifera Aldrich. 



Face not protruding below 4 



4. Thorax with median black line and prescutellar spot . 



dimidiata Loew. 

 Thorax with prescutellar spot only 5 



5. Metanotum entirely black carbonifer Loew. 



Metanotum only infuscated above ". rubella Loew. 



6. Abdomen fasciate with vivid metallic green. . .superbiens Loew. 

 Abdomen fasciate with black 7 



7. Abdomen black, venter and posterior edges of segments yellow. 



lienosa, sp. nov. 

 Abdomen yellow, bases of segments black tenuis (Loew.) 



72. Neurigona floridula, sp. nov. 



Female. Length 4.5-5 mm.; length of wing 4.75-5 mm. Proboscis red- 

 dish yellow with pale hairs. Palpi and face pale yellow thickly covered with 

 silvery white dust, the latter of the usual width for the female, and with the 

 portion below the transverse suture receding. Antennae yellow, third joint 

 lacking in my specimens. Front and occiput black, thickly covered with 

 silvery white dust. Postocular cilia silvery white. Eyes green. Thorax, 

 scutellum and abdomen reddish yellow, covered with white dust, which is 

 most abundant on the lateral portions of the thoracic dorsum and the pleurae. 

 Prescutellar depression shallow. Scutellum with two median long bristles 

 and two feeble lateral bristles. Abdomen covered with short black hairs. 

 Pleurae with a black spot below the insertion of the wing. Coxae reddish yel- 

 low, dusted with white like the pleurae. Anterior surfaces of fore coxae beset 

 with short white hairs and with a few conspicuous black bristles near their 

 proximal ends. Similar bristles occur in a corresponding position in the mid- 

 dle coxae. Hind coxa with a single bristle on the lateral surface and a few 

 bristles near the tip. Legs and metathoracic epimera light yellow, the former 

 very slender and covered with small black hairs. Last joint of all the tarsi 

 black. Fore tarsi twice as long as the fore tibiae, middle tarsi nearly twice as 

 long as the middle tibiae, hind tarsi scarcely as long as the hind tibiae. Hind 

 metatarsus distinctly shorter than the succeeding joint. Wings scarcely nar- 

 rowed towards the base, distinctly yellowish, with yellow veins. Apical seg- 

 ment of fourth vein rather sharply bent upwards near its middle and ending 

 rather close to the tip of the third vein. Posterior cross-vein about two and 

 one-half times its length distant from the posterior margin measured along 

 the distal segment of the fifth vein. Halteres and tegulae yellow, the latter 

 with yellow cilia. 



