Psyllobora are unique lady beetles that feed primarily off powdery mildew. They are tiny and white in overall coloration. They have many spots that are black to light brown in coloration.

Psyllobora borealis or the Western Fairy Ladybird is a species of ladybug in the genus Psyllobora. This species is endemic to the west coast of the united states and the midwest, its range cutting off at a small population in New Mexico. It is found under foliage in forested areas of Western North America..

Psyllobora borealis is identified by having widely spaced spots towards the middle of the abdomen, and a spot 1/3 of the way back from the pronotum (the area above the head of the ladybug). The spots are more widely spaced than those of Psyllobora vigintimaculata.

For more information see: This Bugguide Post 

Psyllobora vigintimaculata or the American Fairy Ladybird is a species of ladybug in the genus Psyllobora endemic to North America. It is found across the entirty of the united states with a wide variety of habitats. in the areas of the Pacific Cost Psyllobora vigintimaculata is a very common resident in forested areas, living underneath the leaves of live plants.

 Psyllobora vigintimaculata is identified by having a greyish, yellowish to cream colored overall body ; with spots that merge together. Psyllobora borealis spots in contrast stay seperate. 

For more information on Psyllobora vigintimaculata see: this University Of California Article

Mulsantina picta or the Painted Ladybird is a species of lady beetle found all across the United States. It is found in the west coast by shaking Douglas Fir and similar conifers in which it lives.

It is identified by having brownish overall coloration, with a darker brown W pattern down the middle. It also has yellowish markings underneath it that other species do not have within the genus. 

For more information see: buggide and this california example.

Cycloneda polita or the Western Polished Ladybird is a species of ladybug found exclusively on the west coast of the united states. It is found in various grassy habitats on or around foliage in the spring and summer months. 

It is red with no spots. Its head has a white overall coloration and then as "masklike" black pattern. It has two white shoulder lines.

For more information on this species and similar species see: This article from the University Of California.

Adalia bipunctata or the Two Spot Ladybird is a species of ladybug endemic to the United States. It is found on foliage in the summer and in grassy habitats.

It is red with two black spots. its head is white with intersecting black "waves". It has two white patches near the eyes. It has no shoulder coloration.

Harmonia axyridis or the Asian Ladybird is a ladybeetle introduced to the United States from China and the surrounding area. It will eat some pests but generally ends up being a bothersome overwintering insect in sheds and related areas in the winter.

It is identified by having an M pattern on the headplate, and 2 or more spots. Some have none. This group extremely variable, but the M pattern is consistent.   

Coccinella septempunctata or the Seven Spotted Ladybird is a ladybeetle introduced to the united states from africa and eurasia. 

It is identified by having a black headplate with two white dots near the eyes, and 7 spots, one large spot above the tip of the headplate. There are white lines above the headplate under the big spot.